refactor: remove old updater

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

33 files changed, 59 insertions, 2230 deletions

diff --git a/launcher/Application.cpp b/launcher/Application.cpp
index ea8d2326..8fe5a8bf 100644
--- a/launcher/Application.cpp
+++ b/launcher/Application.cpp
@@ -104,7 +104,7 @@
 
 #include "java/JavaUtils.h"
 
-#include "updater/UpdateChecker.h"
+#include "updater/ExternalUpdater.h"
 
 #include "tools/JProfiler.h"
 #include "tools/JVisualVM.h"
@@ -127,6 +127,10 @@
 #include "gamemode_client.h"
 #endif
 
+#ifdef Q_OS_MAC
+#include "updater/MacSparkleUpdater.h"
+#endif
+
 
 #if defined Q_OS_WIN32
 #ifndef WIN32_LEAN_AND_MEAN
@@ -162,45 +166,6 @@ void appDebugOutput(QtMsgType type, const QMessageLogContext &context, const QSt
     fflush(stderr);
 }
 
-QString getIdealPlatform(QString currentPlatform) {
-    auto info = Sys::getKernelInfo();
-    switch(info.kernelType) {
-        case Sys::KernelType::Darwin: {
-            if(info.kernelMajor >= 17) {
-                // macOS 10.13 or newer
-                return "osx64-5.15.2";
-            }
-            else {
-                // macOS 10.12 or older
-                return "osx64";
-            }
-        }
-        case Sys::KernelType::Windows: {
-            // FIXME: 5.15.2 is not stable on Windows, due to a large number of completely unpredictable and hard to reproduce issues
-            break;
-/*
-            if(info.kernelMajor == 6 && info.kernelMinor >= 1) {
-                // Windows 7
-                return "win32-5.15.2";
-            }
-            else if (info.kernelMajor > 6) {
-                // Above Windows 7
-                return "win32-5.15.2";
-            }
-            else {
-                // Below Windows 7
-                return "win32";
-            }
-*/
-        }
-        case Sys::KernelType::Undetermined:
-        case Sys::KernelType::Linux: {
-            break;
-        }
-    }
-    return currentPlatform;
-}
-
 }
 
 Application::Application(int &argc, char **argv) : QApplication(argc, argv)
@@ -490,10 +455,6 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
     {
         // Provide a fallback for migration from PolyMC
         m_settings.reset(new INISettingsObject({ BuildConfig.LAUNCHER_CONFIGFILE, "polymc.cfg", "multimc.cfg" }, this));
-        // Updates
-        // Multiple channels are separated by spaces
-        m_settings->registerSetting("UpdateChannel", BuildConfig.VERSION_CHANNEL);
-        m_settings->registerSetting("AutoUpdate", true);
 
         // Theming
         m_settings->registerSetting("IconTheme", QString("pe_colored"));
@@ -724,10 +685,10 @@ Application::Application(int &argc, char **argv) : QApplication(argc, argv)
     // initialize the updater
     if(BuildConfig.UPDATER_ENABLED)
     {
-        auto platform = getIdealPlatform(BuildConfig.BUILD_PLATFORM);
-        auto channelUrl = BuildConfig.UPDATER_BASE + platform + "/channels.json";
-        qDebug() << "Initializing updater with platform: " << platform << " -- " << channelUrl;
-        m_updateChecker.reset(new UpdateChecker(m_network, channelUrl, BuildConfig.VERSION_CHANNEL));
+        qDebug() << "Initializing updater";
+#ifdef Q_OS_MAC
+        m_updater.reset(new MacSparkleUpdater());
+#endif
         qDebug() << "<> Updater started.";
     }
 
@@ -1690,3 +1651,14 @@ bool Application::handleDataMigration(const QString& currentData,
     }
     return true;
 }
+
+void Application::triggerUpdateCheck()
+{
+    if (m_updater) {
+        qDebug() << "Checking for updates.";
+        m_updater->setBetaAllowed(false);  // There are no other channels than stable
+        m_updater->checkForUpdates();
+    } else {
+        qDebug() << "Updater not available.";
+    }
+}
diff --git a/launcher/Application.h b/launcher/Application.h
index 7884227a..23c70e4c 100644
--- a/launcher/Application.h
+++ b/launcher/Application.h
@@ -43,7 +43,6 @@
 #include <QIcon>
 #include <QDateTime>
 #include <QUrl>
-#include <updater/GoUpdate.h>
 
 #include <BaseInstance.h>
 
@@ -63,7 +62,7 @@ class AccountList;
 class IconList;
 class QNetworkAccessManager;
 class JavaInstallList;
-class UpdateChecker;
+class ExternalUpdater;
 class BaseProfilerFactory;
 class BaseDetachedToolFactory;
 class TranslationsModel;
@@ -124,10 +123,12 @@ public:
 
     void setApplicationTheme(const QString& name, bool initial);
 
-    shared_qobject_ptr<UpdateChecker> updateChecker() {
-        return m_updateChecker;
+    shared_qobject_ptr<ExternalUpdater> updater() {
+        return m_updater;
     }
 
+    void triggerUpdateCheck();
+
     std::shared_ptr<TranslationsModel> translations();
 
     std::shared_ptr<JavaInstallList> javalist();
@@ -248,7 +249,7 @@ private:
 
     shared_qobject_ptr<QNetworkAccessManager> m_network;
 
-    shared_qobject_ptr<UpdateChecker> m_updateChecker;
+    shared_qobject_ptr<ExternalUpdater> m_updater;
     shared_qobject_ptr<AccountList> m_accounts;
 
     shared_qobject_ptr<HttpMetaCache> m_metacache;
@@ -307,4 +308,3 @@ public:
     QString m_instanceIdToShowWindowOf;
     std::unique_ptr<QFile> logFile;
 };
-
diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index e8afa6b8..528c7990 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -150,12 +150,6 @@ set(LAUNCH_SOURCES
 
 # Old update system
 set(UPDATE_SOURCES
-    updater/GoUpdate.h
-    updater/GoUpdate.cpp
-    updater/UpdateChecker.h
-    updater/UpdateChecker.cpp
-    updater/DownloadTask.h
-    updater/DownloadTask.cpp
     updater/ExternalUpdater.h
 )
 
@@ -578,8 +572,6 @@ SET(LAUNCHER_SOURCES
     Application.cpp
     DataMigrationTask.h
     DataMigrationTask.cpp
-    UpdateController.cpp
-    UpdateController.h
     ApplicationMessage.h
     ApplicationMessage.cpp
 
@@ -814,8 +806,6 @@ SET(LAUNCHER_SOURCES
     ui/dialogs/ProgressDialog.h
     ui/dialogs/ReviewMessageBox.cpp
     ui/dialogs/ReviewMessageBox.h
-    ui/dialogs/UpdateDialog.cpp
-    ui/dialogs/UpdateDialog.h
     ui/dialogs/VersionSelectDialog.cpp
     ui/dialogs/VersionSelectDialog.h
     ui/dialogs/SkinUploadDialog.cpp
@@ -937,7 +927,6 @@ qt_wrap_ui(LAUNCHER_UI
     ui/dialogs/ProfileSetupDialog.ui
     ui/dialogs/ProgressDialog.ui
     ui/dialogs/NewInstanceDialog.ui
-    ui/dialogs/UpdateDialog.ui
     ui/dialogs/NewComponentDialog.ui
     ui/dialogs/NewsDialog.ui
     ui/dialogs/ProfileSelectDialog.ui
diff --git a/launcher/UpdateController.cpp b/launcher/UpdateController.cpp
deleted file mode 100644
index 9ff44854..00000000
--- a/launcher/UpdateController.cpp
+++ /dev/null
@@ -1,443 +0,0 @@
-#include <QFile>
-#include <QMessageBox>
-#include <FileSystem.h>
-#include <updater/GoUpdate.h>
-#include "UpdateController.h"
-#include <QApplication>
-#include <thread>
-#include <chrono>
-#include <LocalPeer.h>
-
-#include "BuildConfig.h"
-
-
-// from <sys/stat.h>
-#ifndef S_IRUSR
-#define __S_IREAD 0400         /* Read by owner.  */
-#define __S_IWRITE 0200        /* Write by owner.  */
-#define __S_IEXEC 0100         /* Execute by owner.  */
-#define S_IRUSR __S_IREAD      /* Read by owner.  */
-#define S_IWUSR __S_IWRITE     /* Write by owner.  */
-#define S_IXUSR __S_IEXEC      /* Execute by owner.  */
-
-#define S_IRGRP (S_IRUSR >> 3) /* Read by group.  */
-#define S_IWGRP (S_IWUSR >> 3) /* Write by group.  */
-#define S_IXGRP (S_IXUSR >> 3) /* Execute by group.  */
-
-#define S_IROTH (S_IRGRP >> 3) /* Read by others.  */
-#define S_IWOTH (S_IWGRP >> 3) /* Write by others.  */
-#define S_IXOTH (S_IXGRP >> 3) /* Execute by others.  */
-#endif
-static QFile::Permissions unixModeToPermissions(const int mode)
-{
-    QFile::Permissions perms;
-
-    if (mode & S_IRUSR)
-    {
-        perms |= QFile::ReadUser;
-    }
-    if (mode & S_IWUSR)
-    {
-        perms |= QFile::WriteUser;
-    }
-    if (mode & S_IXUSR)
-    {
-        perms |= QFile::ExeUser;
-    }
-
-    if (mode & S_IRGRP)
-    {
-        perms |= QFile::ReadGroup;
-    }
-    if (mode & S_IWGRP)
-    {
-        perms |= QFile::WriteGroup;
-    }
-    if (mode & S_IXGRP)
-    {
-        perms |= QFile::ExeGroup;
-    }
-
-    if (mode & S_IROTH)
-    {
-        perms |= QFile::ReadOther;
-    }
-    if (mode & S_IWOTH)
-    {
-        perms |= QFile::WriteOther;
-    }
-    if (mode & S_IXOTH)
-    {
-        perms |= QFile::ExeOther;
-    }
-    return perms;
-}
-
-static const QLatin1String liveCheckFile("live.check");
-
-UpdateController::UpdateController(QWidget * parent, const QString& root, const QString updateFilesDir, GoUpdate::OperationList operations)
-{
-    m_parent = parent;
-    m_root = root;
-    m_updateFilesDir = updateFilesDir;
-    m_operations = operations;
-}
-
-
-void UpdateController::installUpdates()
-{
-    qint64 pid = -1;
-    QStringList args;
-    bool started = false;
-
-    qDebug() << "Installing updates.";
-#ifdef Q_OS_WIN
-    QString finishCmd = QApplication::applicationFilePath();
-#elif defined(Q_OS_LINUX) || defined(Q_OS_FREEBSD) || defined (Q_OS_OPENBSD)
-    QString finishCmd = FS::PathCombine(m_root, BuildConfig.LAUNCHER_NAME);
-#elif defined Q_OS_MAC
-    QString finishCmd = QApplication::applicationFilePath();
-#else
-#error Unsupported operating system.
-#endif
-
-    QString backupPath = FS::PathCombine(m_root, "update", "backup");
-    QDir origin(m_root);
-
-    // clean up the backup folder. it should be empty before we start
-    if(!FS::deletePath(backupPath))
-    {
-        qWarning() << "couldn't remove previous backup folder" << backupPath;
-    }
-    // and it should exist.
-    if(!FS::ensureFolderPathExists(backupPath))
-    {
-        qWarning() << "couldn't create folder" << backupPath;
-        return;
-    }
-
-    bool useXPHack = false;
-    QString exePath;
-    QString exeOrigin;
-    QString exeBackup;
-
-    // perform the update operations
-    for(auto op: m_operations)
-    {
-        switch(op.type)
-        {
-            // replace = move original out to backup, if it exists, move the new file in its place
-            case GoUpdate::Operation::OP_REPLACE:
-            {
-#ifdef Q_OS_WIN32
-                QString windowsExeName = BuildConfig.LAUNCHER_NAME + ".exe";
-                // hack for people renaming the .exe because ... reasons :)
-                if(op.destination == windowsExeName)
-                {
-                    op.destination = QFileInfo(QApplication::applicationFilePath()).fileName();
-                }
-#endif
-                QFileInfo destination (FS::PathCombine(m_root, op.destination));
-                if(destination.exists())
-                {
-                    QString backupName = op.destination;
-                    backupName.replace('/', '_');
-                    QString backupFilePath = FS::PathCombine(backupPath, backupName);
-                    if(!QFile::rename(destination.absoluteFilePath(), backupFilePath))
-                    {
-                        qWarning() << "Couldn't move:" << destination.absoluteFilePath() << "to" << backupFilePath;
-                        m_failedOperationType = Replace;
-                        m_failedFile = op.destination;
-                        fail();
-                        return;
-                    }
-                    BackupEntry be;
-                    be.original = destination.absoluteFilePath();
-                    be.backup = backupFilePath;
-                    be.update = op.source;
-                    m_replace_backups.append(be);
-                }
-                // make sure the folder we are putting this into exists
-                if(!FS::ensureFilePathExists(destination.absoluteFilePath()))
-                {
-                    qWarning() << "REPLACE: Couldn't create folder:" << destination.absoluteFilePath();
-                    m_failedOperationType = Replace;
-                    m_failedFile = op.destination;
-                    fail();
-                    return;
-                }
-                // now move the new file in
-                if(!QFile::rename(op.source, destination.absoluteFilePath()))
-                {
-                    qWarning() << "REPLACE: Couldn't move:" << op.source << "to" << destination.absoluteFilePath();
-                    m_failedOperationType = Replace;
-                    m_failedFile = op.destination;
-                    fail();
-                    return;
-                }
-                QFile::setPermissions(destination.absoluteFilePath(), unixModeToPermissions(op.destinationMode));
-            }
-            break;
-            // delete = move original to backup
-            case GoUpdate::Operation::OP_DELETE:
-            {
-                QString destFilePath = FS::PathCombine(m_root, op.destination);
-                if(QFile::exists(destFilePath))
-                {
-                    QString backupName = op.destination;
-                    backupName.replace('/', '_');
-                    QString trashFilePath = FS::PathCombine(backupPath, backupName);
-
-                    if(!QFile::rename(destFilePath, trashFilePath))
-                    {
-                        qWarning() << "DELETE: Couldn't move:" << op.destination << "to" << trashFilePath;
-                        m_failedFile = op.destination;
-                        m_failedOperationType = Delete;
-                        fail();
-                        return;
-                    }
-                    BackupEntry be;
-                    be.original = destFilePath;
-                    be.backup = trashFilePath;
-                    m_delete_backups.append(be);
-                }
-            }
-            break;
-        }
-    }
-
-    // try to start the new binary
-    args = qApp->arguments();
-    args.removeFirst();
-
-    // on old Windows, do insane things... no error checking here, this is just to have something.
-    if(useXPHack)
-    {
-        QString script;
-        auto nativePath = QDir::toNativeSeparators(exePath);
-        auto nativeOriginPath = QDir::toNativeSeparators(exeOrigin);
-        auto nativeBackupPath = QDir::toNativeSeparators(exeBackup);
-
-        // so we write this vbscript thing...
-        QTextStream out(&script);
-        out << "WScript.Sleep 1000\n";
-        out << "Set fso=CreateObject(\"Scripting.FileSystemObject\")\n";
-        out << "Set shell=CreateObject(\"WScript.Shell\")\n";
-        out << "fso.MoveFile \"" << nativePath << "\", \"" << nativeBackupPath << "\"\n";
-        out << "fso.MoveFile \"" << nativeOriginPath << "\", \"" << nativePath << "\"\n";
-        out << "shell.Run \"" << nativePath << "\"\n";
-
-        QString scriptPath = FS::PathCombine(m_root, "update", "update.vbs");
-
-        // we save it
-        QFile scriptFile(scriptPath);
-        scriptFile.open(QIODevice::WriteOnly);
-        scriptFile.write(script.toLocal8Bit().replace("\n", "\r\n"));
-        scriptFile.close();
-
-        // we run it
-        started = QProcess::startDetached("wscript", {scriptPath}, m_root);
-
-        // and we quit. conscious thought.
-        qApp->quit();
-        return;
-    }
-    bool doLiveCheck = true;
-    bool startFailed = false;
-
-    // remove live check file, if any
-    if(QFile::exists(liveCheckFile))
-    {
-        if(!QFile::remove(liveCheckFile))
-        {
-            qWarning() << "Couldn't remove the" << liveCheckFile << "file! We will proceed without :(";
-            doLiveCheck = false;
-        }
-    }
-
-    if(doLiveCheck)
-    {
-        if(!args.contains("--alive"))
-        {
-            args.append("--alive");
-        }
-    }
-
-    // FIXME: reparse args and construct a safe variant from scratch. This is a workaround for GH-1874:
-    QStringList realargs;
-    int skip = 0;
-    for(auto & arg: args)
-    {
-        if(skip)
-        {
-            skip--;
-            continue;
-        }
-        if(arg == "-l")
-        {
-            skip = 1;
-            continue;
-        }
-        realargs.append(arg);
-    }
-
-    // start the updated application
-    started = QProcess::startDetached(finishCmd, realargs, QDir::currentPath(), &pid);
-    // much dumber check - just find out if the call
-    if(!started || pid == -1)
-    {
-        qWarning() << "Couldn't start new process properly!";
-        startFailed = true;
-    }
-    if(!startFailed && doLiveCheck)
-    {
-        int attempts = 0;
-        while(attempts < 10)
-        {
-            attempts++;
-            QString key;
-            std::this_thread::sleep_for(std::chrono::milliseconds(250));
-            if(!QFile::exists(liveCheckFile))
-            {
-                qWarning() << "Couldn't find the" << liveCheckFile << "file!";
-                startFailed = true;
-                continue;
-            }
-            try
-            {
-                key = QString::fromUtf8(FS::read(liveCheckFile));
-                auto id = ApplicationId::fromRawString(key);
-                LocalPeer peer(nullptr, id);
-                if(peer.isClient())
-                {
-                    startFailed = false;
-                    qDebug() << "Found process started with key " << key;
-                    break;
-                }
-                else
-                {
-                    startFailed = true;
-                    qDebug() << "Process started with key " << key << "apparently died or is not reponding...";
-                    break;
-                }
-            }
-            catch (const Exception &e)
-            {
-                qWarning() << "Couldn't read the" << liveCheckFile << "file!";
-                startFailed = true;
-                continue;
-            }
-        }
-    }
-    if(startFailed)
-    {
-        m_failedOperationType = Start;
-        fail();
-        return;
-    }
-    else
-    {
-        origin.rmdir(m_updateFilesDir);
-        qApp->quit();
-        return;
-    }
-}
-
-void UpdateController::fail()
-{
-    qWarning() << "Update failed!";
-
-    QString msg;
-    bool doRollback = false;
-    QString failTitle = QObject::tr("Update failed!");
-    QString rollFailTitle = QObject::tr("Rollback failed!");
-    switch (m_failedOperationType)
-    {
-        case Replace:
-        {
-            msg = QObject::tr(
-                "Couldn't replace file %1. Changes will be reverted.\n"
-                "See the %2 log file for details."
-            ).arg(m_failedFile, BuildConfig.LAUNCHER_DISPLAYNAME);
-            doRollback = true;
-            QMessageBox::critical(m_parent, failTitle, msg);
-            break;
-        }
-        case Delete:
-        {
-            msg = QObject::tr(
-                "Couldn't remove file %1. Changes will be reverted.\n"
-                "See the %2 log file for details."
-            ).arg(m_failedFile, BuildConfig.LAUNCHER_DISPLAYNAME);
-            doRollback = true;
-            QMessageBox::critical(m_parent, failTitle, msg);
-            break;
-        }
-        case Start:
-        {
-            msg = QObject::tr("The new version didn't start or is too old and doesn't respond to startup checks.\n"
-                "\n"
-                "Roll back to previous version?");
-            auto result = QMessageBox::critical(
-                m_parent,
-                failTitle,
-                msg,
-                QMessageBox::Yes | QMessageBox::No,
-                QMessageBox::Yes
-            );
-            doRollback = (result == QMessageBox::Yes);
-            break;
-        }
-        case Nothing:
-        default:
-            return;
-    }
-    if(doRollback)
-    {
-        auto rollbackOK = rollback();
-        if(!rollbackOK)
-        {
-            msg = QObject::tr("The rollback failed too.\n"
-                "You will have to repair %1 manually.\n"
-                "Please let us know why and how this happened.").arg(BuildConfig.LAUNCHER_DISPLAYNAME);
-            QMessageBox::critical(m_parent, rollFailTitle, msg);
-            qApp->quit();
-        }
-    }
-    else
-    {
-        qApp->quit();
-    }
-}
-
-bool UpdateController::rollback()
-{
-    bool revertOK = true;
-    // if the above failed, roll back changes
-    for(auto backup:m_replace_backups)
-    {
-        qWarning() << "restoring" << backup.original << "from" << backup.backup;
-        if(!QFile::rename(backup.original, backup.update))
-        {
-            revertOK = false;
-            qWarning() << "moving new" << backup.original << "back to" << backup.update << "failed!";
-            continue;
-        }
-
-        if(!QFile::rename(backup.backup, backup.original))
-        {
-            revertOK = false;
-            qWarning() << "restoring" << backup.original << "failed!";
-        }
-    }
-    for(auto backup:m_delete_backups)
-    {
-        qWarning() << "restoring" << backup.original << "from" << backup.backup;
-        if(!QFile::rename(backup.backup, backup.original))
-        {
-            revertOK = false;
-            qWarning() << "restoring" << backup.original << "failed!";
-        }
-    }
-    return revertOK;
-}
diff --git a/launcher/UpdateController.h b/launcher/UpdateController.h
deleted file mode 100644
index 715554e5..00000000
--- a/launcher/UpdateController.h
+++ /dev/null
@@ -1,44 +0,0 @@
-#pragma once
-
-#include <QString>
-#include <QList>
-#include <updater/GoUpdate.h>
-
-class QWidget;
-
-class UpdateController
-{
-public:
-    UpdateController(QWidget * parent, const QString &root, const QString updateFilesDir, GoUpdate::OperationList operations);
-    void installUpdates();
-
-private:
-    void fail();
-    bool rollback();
-
-private:
-    QString m_root;
-    QString m_updateFilesDir;
-    GoUpdate::OperationList m_operations;
-    QWidget * m_parent;
-
-    struct BackupEntry
-    {
-        // path where we got the new file from
-        QString update;
-        // path of what is being actually updated
-        QString original;
-        // path where the backup of the updated file was placed
-        QString backup;
-    };
-    QList <BackupEntry> m_replace_backups;
-    QList <BackupEntry> m_delete_backups;
-    enum Failure
-    {
-        Replace,
-        Delete,
-        Start,
-        Nothing
-    } m_failedOperationType = Nothing;
-    QString m_failedFile;
-};
diff --git a/launcher/minecraft/launch/LauncherPartLaunch.cpp b/launcher/minecraft/launch/LauncherPartLaunch.cpp
index 1d8d7083..8ecf715d 100644
--- a/launcher/minecraft/launch/LauncherPartLaunch.cpp
+++ b/launcher/minecraft/launch/LauncherPartLaunch.cpp
@@ -36,6 +36,7 @@
 #include "LauncherPartLaunch.h"
 
 #include <QStandardPaths>
+#include <QRegularExpression>
 
 #include "launch/LaunchTask.h"
 #include "minecraft/MinecraftInstance.h"
diff --git a/launcher/net/MetaCacheSink.cpp b/launcher/net/MetaCacheSink.cpp
index 5ae53c1c..c730fdbf 100644
--- a/launcher/net/MetaCacheSink.cpp
+++ b/launcher/net/MetaCacheSink.cpp
@@ -36,6 +36,7 @@
 #include "MetaCacheSink.h"
 #include <QFile>
 #include <QFileInfo>
+#include <QRegularExpression>
 #include "Application.h"
 
 namespace Net {
diff --git a/launcher/net/PasteUpload.cpp b/launcher/net/PasteUpload.cpp
index 76b86743..d9e785c5 100644
--- a/launcher/net/PasteUpload.cpp
+++ b/launcher/net/PasteUpload.cpp
@@ -41,9 +41,11 @@
 
 #include <QDebug>
 #include <QJsonObject>
+#include <QHttpPart>
 #include <QJsonArray>
 #include <QJsonDocument>
 #include <QFile>
+#include <QUrlQuery>
 
 std::array<PasteUpload::PasteTypeInfo, 4> PasteUpload::PasteTypes = {
     {{"0x0.st", "https://0x0.st", ""},
diff --git a/launcher/ui/GuiUtil.cpp b/launcher/ui/GuiUtil.cpp
index 5a62e4d0..b1ea5ee9 100644
--- a/launcher/ui/GuiUtil.cpp
+++ b/launcher/ui/GuiUtil.cpp
@@ -39,6 +39,7 @@
 #include <QClipboard>
 #include <QApplication>
 #include <QFileDialog>
+#include <QStandardPaths>
 
 #include "ui/dialogs/ProgressDialog.h"
 #include "ui/dialogs/CustomMessageBox.h"
diff --git a/launcher/ui/MainWindow.cpp b/launcher/ui/MainWindow.cpp
index 929f2a85..0595634f 100644
--- a/launcher/ui/MainWindow.cpp
+++ b/launcher/ui/MainWindow.cpp
@@ -83,8 +83,7 @@
 #include <net/Download.h>
 #include <news/NewsChecker.h>
 #include <tools/BaseProfiler.h>
-#include <updater/DownloadTask.h>
-#include <updater/UpdateChecker.h>
+#include <updater/ExternalUpdater.h>
 #include <DesktopServices.h>
 #include "InstanceWindow.h"
 #include "InstancePageProvider.h"
@@ -99,16 +98,13 @@
 #include "ui/dialogs/NewsDialog.h"
 #include "ui/dialogs/ProgressDialog.h"
 #include "ui/dialogs/AboutDialog.h"
-#include "ui/dialogs/VersionSelectDialog.h"
 #include "ui/dialogs/CustomMessageBox.h"
 #include "ui/dialogs/IconPickerDialog.h"
 #include "ui/dialogs/CopyInstanceDialog.h"
-#include "ui/dialogs/UpdateDialog.h"
 #include "ui/dialogs/EditAccountDialog.h"
 #include "ui/dialogs/ExportInstanceDialog.h"
 #include "ui/themes/ITheme.h"
 
-#include "UpdateController.h"
 #include "KonamiCode.h"
 
 #include "InstanceImportTask.h"
@@ -1039,9 +1035,7 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new MainWindow
         updateNewsLabel();
     }
 
-
-    if(BuildConfig.UPDATER_ENABLED)
-    {
+    if (BuildConfig.UPDATER_ENABLED) {
         bool updatesAllowed = APPLICATION->updatesAreAllowed();
         updatesAllowedChanged(updatesAllowed);
 
@@ -1049,21 +1043,10 @@ MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new MainWindow
         connect(ui->actionCheckUpdate.operator->(), &QAction::triggered, this, &MainWindow::checkForUpdates);
 
         // set up the updater object.
-        auto updater = APPLICATION->updateChecker();
-        connect(updater.get(), &UpdateChecker::updateAvailable, this, &MainWindow::updateAvailable);
-        connect(updater.get(), &UpdateChecker::noUpdateFound, this, &MainWindow::updateNotAvailable);
-        // if automatic update checks are allowed, start one.
-        if (APPLICATION->settings()->get("AutoUpdate").toBool() && updatesAllowed)
-        {
-            updater->checkForUpdate(APPLICATION->settings()->get("UpdateChannel").toString(), false);
-        }
+        auto updater = APPLICATION->updater();
 
-        if (APPLICATION->updateChecker()->getExternalUpdater())
-        {
-            connect(APPLICATION->updateChecker()->getExternalUpdater(),
-                    &ExternalUpdater::canCheckForUpdatesChanged,
-                    this,
-                    &MainWindow::updatesAllowedChanged);
+        if (updater) {
+            connect(updater.get(), &ExternalUpdater::canCheckForUpdatesChanged, this, &MainWindow::updatesAllowedChanged);
         }
     }
 
@@ -1541,32 +1524,6 @@ void MainWindow::updateNewsLabel()
     }
 }
 
-void MainWindow::updateAvailable(GoUpdate::Status status)
-{
-    if(!APPLICATION->updatesAreAllowed())
-    {
-        updateNotAvailable();
-        return;
-    }
-    UpdateDialog dlg(true, this);
-    UpdateAction action = (UpdateAction)dlg.exec();
-    switch (action)
-    {
-    case UPDATE_LATER:
-        qDebug() << "Update will be installed later.";
-        break;
-    case UPDATE_NOW:
-        downloadUpdates(status);
-        break;
-    }
-}
-
-void MainWindow::updateNotAvailable()
-{
-    UpdateDialog dlg(false, this);
-    dlg.exec();
-}
-
 QList<int> stringToIntList(const QString &string)
 {
 #if QT_VERSION >= QT_VERSION_CHECK(5, 14, 0)
@@ -1591,40 +1548,6 @@ QString intListToString(const QList<int> &list)
     return slist.join(',');
 }
 
-void MainWindow::downloadUpdates(GoUpdate::Status status)
-{
-    if(!APPLICATION->updatesAreAllowed())
-    {
-        return;
-    }
-    qDebug() << "Downloading updates.";
-    ProgressDialog updateDlg(this);
-    status.rootPath = APPLICATION->root();
-
-    auto dlPath = FS::PathCombine(APPLICATION->root(), "update", "XXXXXX");
-    if (!FS::ensureFilePathExists(dlPath))
-    {
-        CustomMessageBox::selectable(this, tr("Error"), tr("Couldn't create folder for update downloads:\n%1").arg(dlPath), QMessageBox::Warning)->show();
-    }
-    GoUpdate::DownloadTask updateTask(APPLICATION->network(), status, dlPath, &updateDlg);
-    // If the task succeeds, install the updates.
-    if (updateDlg.execWithTask(&updateTask))
-    {
-        /**
-         * NOTE: This disables launching instances until the update either succeeds (and this process exits)
-         * or the update fails (and the control leaves this scope).
-         */
-        APPLICATION->updateIsRunning(true);
-        UpdateController update(this, APPLICATION->root(), updateTask.updateFilesDir(), updateTask.operations());
-        update.installUpdates();
-        APPLICATION->updateIsRunning(false);
-    }
-    else
-    {
-        CustomMessageBox::selectable(this, tr("Error"), updateTask.failReason(), QMessageBox::Warning)->show();
-    }
-}
-
 void MainWindow::onCatToggled(bool state)
 {
     setCatBackground(state);
@@ -1941,8 +1864,7 @@ void MainWindow::checkForUpdates()
 {
     if(BuildConfig.UPDATER_ENABLED)
     {
-        auto updater = APPLICATION->updateChecker();
-        updater->checkForUpdate(APPLICATION->settings()->get("UpdateChannel").toString(), true);
+        APPLICATION->triggerUpdateCheck();
     }
     else
     {
diff --git a/launcher/ui/MainWindow.h b/launcher/ui/MainWindow.h
index 0aa01ee2..53db4919 100644
--- a/launcher/ui/MainWindow.h
+++ b/launcher/ui/MainWindow.h
@@ -48,7 +48,6 @@
 #include "BaseInstance.h"
 #include "minecraft/auth/MinecraftAccount.h"
 #include "net/NetJob.h"
-#include "updater/GoUpdate.h"
 
 class LaunchController;
 class NewsChecker;
@@ -188,10 +187,6 @@ private slots:
 
     void startTask(Task *task);
 
-    void updateAvailable(GoUpdate::Status status);
-
-    void updateNotAvailable();
-
     void defaultAccountChanged();
 
     void changeActiveAccount();
@@ -200,10 +195,6 @@ private slots:
 
     void updateNewsLabel();
 
-    /*!
-     * Runs the DownloadTask and installs updates.
-     */
-    void downloadUpdates(GoUpdate::Status status);
 
     void konamiTriggered();
 
@@ -252,4 +243,3 @@ private:
     // managed by the application object
     Task *m_versionLoadTask = nullptr;
 };
-
diff --git a/launcher/ui/dialogs/BlockedModsDialog.cpp b/launcher/ui/dialogs/BlockedModsDialog.cpp
index edb4ff7d..eeeeb709 100644
--- a/launcher/ui/dialogs/BlockedModsDialog.cpp
+++ b/launcher/ui/dialogs/BlockedModsDialog.cpp
@@ -1,14 +1,18 @@
 #include "BlockedModsDialog.h"
-#include <QDesktopServices>
-#include <QDialogButtonBox>
-#include <QPushButton>
-#include "Application.h"
 #include "ui_BlockedModsDialog.h"
 
+#include "Application.h"
+
 #include <QDebug>
+#include <QDesktopServices>
+#include <QDialogButtonBox>
+#include <QDir>
+#include <QDirIterator>
 #include <QDragEnterEvent>
 #include <QFileDialog>
 #include <QFileInfo>
+#include <QMimeData>
+#include <QPushButton>
 #include <QStandardPaths>
 
 BlockedModsDialog::BlockedModsDialog(QWidget* parent, const QString& title, const QString& text, QList<BlockedMod>& mods)
diff --git a/launcher/ui/dialogs/ExportInstanceDialog.cpp b/launcher/ui/dialogs/ExportInstanceDialog.cpp
index 88552b23..f13e36e8 100644
--- a/launcher/ui/dialogs/ExportInstanceDialog.cpp
+++ b/launcher/ui/dialogs/ExportInstanceDialog.cpp
@@ -44,6 +44,7 @@
 #include <QSortFilterProxyModel>
 #include <QDebug>
 #include <QSaveFile>
+#include <QStack>
 #include "StringUtils.h"
 #include "SeparatorPrefixTree.h"
 #include "Application.h"
diff --git a/launcher/ui/dialogs/UpdateDialog.cpp b/launcher/ui/dialogs/UpdateDialog.cpp
deleted file mode 100644
index 9e82531a..00000000
--- a/launcher/ui/dialogs/UpdateDialog.cpp
+++ /dev/null
@@ -1,217 +0,0 @@
-// SPDX-License-Identifier: GPL-3.0-only
-/*
- *  PolyMC - Minecraft Launcher
- *  Copyright (C) 2022 Sefa Eyeoglu <contact@scrumplex.net>
- *
- *  This program is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, version 3.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
- *
- * This file incorporates work covered by the following copyright and
- * permission notice:
- *
- *      Copyright 2013-2021 MultiMC Contributors
- *
- *      Licensed under the Apache License, Version 2.0 (the "License");
- *      you may not use this file except in compliance with the License.
- *      You may obtain a copy of the License at
- *
- *          http://www.apache.org/licenses/LICENSE-2.0
- *
- *      Unless required by applicable law or agreed to in writing, software
- *      distributed under the License is distributed on an "AS IS" BASIS,
- *      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- *      See the License for the specific language governing permissions and
- *      limitations under the License.
- */
-
-#include "UpdateDialog.h"
-#include "ui_UpdateDialog.h"
-#include <QDebug>
-#include "Application.h"
-#include <settings/SettingsObject.h>
-#include <Json.h>
-
-#include "BuildConfig.h"
-#include "HoeDown.h"
-
-UpdateDialog::UpdateDialog(bool hasUpdate, QWidget *parent) : QDialog(parent), ui(new Ui::UpdateDialog)
-{
-    ui->setupUi(this);
-    auto channel = APPLICATION->settings()->get("UpdateChannel").toString();
-    if(hasUpdate)
-    {
-        ui->label->setText(tr("A new %1 update is available!").arg(channel));
-    }
-    else
-    {
-        ui->label->setText(tr("No %1 updates found. You are running the latest version.").arg(channel));
-        ui->btnUpdateNow->setHidden(true);
-        ui->btnUpdateLater->setText(tr("Close"));
-    }
-    ui->changelogBrowser->setHtml(tr("<center><h1>Loading changelog...</h1></center>"));
-    loadChangelog();
-    restoreGeometry(QByteArray::fromBase64(APPLICATION->settings()->get("UpdateDialogGeometry").toByteArray()));
-}
-
-UpdateDialog::~UpdateDialog()
-{
-}
-
-void UpdateDialog::loadChangelog()
-{
-    auto channel = APPLICATION->settings()->get("UpdateChannel").toString();
-    dljob = new NetJob("Changelog", APPLICATION->network());
-    QString url;
-    if(channel == "stable")
-    {
-        url = QString("https://raw.githubusercontent.com/PrismLauncher/PrismLauncher/%1/changelog.md").arg(channel);
-        m_changelogType = CHANGELOG_MARKDOWN;
-    }
-    else
-    {
-        url = QString("https://api.github.com/repos/PrismLauncher/PrismLauncher/compare/%1...%2").arg(BuildConfig.GIT_COMMIT, channel);
-        m_changelogType = CHANGELOG_COMMITS;
-    }
-    dljob->addNetAction(Net::Download::makeByteArray(QUrl(url), &changelogData));
-    connect(dljob.get(), &NetJob::succeeded, this, &UpdateDialog::changelogLoaded);
-    connect(dljob.get(), &NetJob::failed, this, &UpdateDialog::changelogFailed);
-    dljob->start();
-}
-
-QString reprocessMarkdown(QByteArray markdown)
-{
-    HoeDown hoedown;
-    QString output = hoedown.process(markdown);
-
-    // HACK: easier than customizing hoedown
-    output.replace(QRegularExpression("GH-([0-9]+)"), "<a href=\"https://github.com/PrismLauncher/PrismLauncher/issues/\\1\">GH-\\1</a>");
-    qDebug() << output;
-    return output;
-}
-
-QString reprocessCommits(QByteArray json)
-{
-    auto channel = APPLICATION->settings()->get("UpdateChannel").toString();
-    try
-    {
-        QString result;
-        auto document = Json::requireDocument(json);
-        auto rootobject = Json::requireObject(document);
-        auto status = Json::requireString(rootobject, "status");
-        auto diff_url = Json::requireString(rootobject, "html_url");
-
-        auto print_commits = [&]()
-        {
-            result += "<table cellspacing=0 cellpadding=2 style='border-width: 1px; border-style: solid'>";
-            auto commitarray = Json::requireArray(rootobject, "commits");
-            for(int i = commitarray.size() - 1; i >= 0; i--)
-            {
-                const auto & commitval = commitarray[i];
-                auto commitobj = Json::requireObject(commitval);
-                auto parents_info = Json::ensureArray(commitobj, "parents");
-                // NOTE: this ignores merge commits, because they have more than one parent
-                if(parents_info.size() > 1)
-                {
-                    continue;
-                }
-                auto commit_url = Json::requireString(commitobj, "html_url");
-                auto commit_info = Json::requireObject(commitobj, "commit");
-                auto commit_message = Json::requireString(commit_info, "message");
-                auto lines = commit_message.split('\n');
-                QRegularExpression regexp("(?<prefix>(GH-(?<issuenr>[0-9]+))|(NOISSUE)|(SCRATCH))? *(?<rest>.*) *");
-                auto match = regexp.match(lines.takeFirst(), 0, QRegularExpression::NormalMatch);
-                auto issuenr = match.captured("issuenr");
-                auto prefix = match.captured("prefix");
-                auto rest = match.captured("rest");
-                result += "<tr><td>";
-                if(issuenr.length())
-                {
-                    result += QString("<a href=\"https://github.com/PrismLauncher/PrismLauncher/issues/%1\">GH-%2</a>").arg(issuenr, issuenr);
-                }
-                else if(prefix.length())
-                {
-                    result += QString("<a href=\"%1\">%2</a>").arg(commit_url, prefix);
-                }
-                else
-                {
-                    result += QString("<a href=\"%1\">NOISSUE</a>").arg(commit_url);
-                }
-                result += "</td>";
-                lines.prepend(rest);
-                result += "<td><p>" + lines.join("<br />") + "</p></td></tr>";
-            }
-            result += "</table>";
-        };
-
-        if(status == "identical")
-        {
-            return QObject::tr("<p>There are no code changes between your current version and latest %1.</p>").arg(channel);
-        }
-        else if(status == "ahead")
-        {
-            result += QObject::tr("<p>Following commits were added since last update:</p>");
-            print_commits();
-        }
-        else if(status == "diverged")
-        {
-            auto commit_ahead = Json::requireInteger(rootobject, "ahead_by");
-            auto commit_behind = Json::requireInteger(rootobject, "behind_by");
-            result += QObject::tr("<p>The update removes %1 commits and adds the following %2:</p>").arg(commit_behind).arg(commit_ahead);
-            print_commits();
-        }
-        result += QObject::tr("<p>You can <a href=\"%1\">look at the changes on github</a>.</p>").arg(diff_url);
-        return result;
-    }
-    catch (const JSONValidationError &e)
-    {
-        qWarning() << "Got an unparseable commit log from github:" << e.what();
-        qDebug() << json;
-    }
-    return QString();
-}
-
-void UpdateDialog::changelogLoaded()
-{
-    QString result;
-    switch(m_changelogType)
-    {
-        case CHANGELOG_COMMITS:
-            result = reprocessCommits(changelogData);
-            break;
-        case CHANGELOG_MARKDOWN:
-            result = reprocessMarkdown(changelogData);
-            break;
-    }
-    changelogData.clear();
-    ui->changelogBrowser->setHtml(result);
-}
-
-void UpdateDialog::changelogFailed(QString reason)
-{
-    ui->changelogBrowser->setHtml(tr("<p align=\"center\" <span style=\"font-size:22pt;\">Failed to fetch changelog... Error: %1</span></p>").arg(reason));
-}
-
-void UpdateDialog::on_btnUpdateLater_clicked()
-{
-    reject();
-}
-
-void UpdateDialog::on_btnUpdateNow_clicked()
-{
-    done(UPDATE_NOW);
-}
-
-void UpdateDialog::closeEvent(QCloseEvent* evt)
-{
-    APPLICATION->settings()->set("UpdateDialogGeometry", saveGeometry().toBase64());
-    QDialog::closeEvent(evt);
-}
diff --git a/launcher/ui/dialogs/UpdateDialog.h b/launcher/ui/dialogs/UpdateDialog.h
deleted file mode 100644
index 07cbe09f..00000000
--- a/launcher/ui/dialogs/UpdateDialog.h
+++ /dev/null
@@ -1,67 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include <QDialog>
-#include "net/NetJob.h"
-
-namespace Ui
-{
-class UpdateDialog;
-}
-
-enum UpdateAction
-{
-    UPDATE_LATER = QDialog::Rejected,
-    UPDATE_NOW = QDialog::Accepted,
-};
-
-enum ChangelogType
-{
-    CHANGELOG_MARKDOWN,
-    CHANGELOG_COMMITS
-};
-
-class UpdateDialog : public QDialog
-{
-    Q_OBJECT
-
-public:
-    explicit UpdateDialog(bool hasUpdate = true, QWidget *parent = 0);
-    ~UpdateDialog();
-
-public slots:
-    void on_btnUpdateNow_clicked();
-    void on_btnUpdateLater_clicked();
-
-    /// Starts loading the changelog
-    void loadChangelog();
-
-    /// Slot for when the chengelog loads successfully.
-    void changelogLoaded();
-
-    /// Slot for when the chengelog fails to load...
-    void changelogFailed(QString reason);
-
-protected:
-    void closeEvent(QCloseEvent * ) override;
-
-private:
-    Ui::UpdateDialog *ui;
-    QByteArray changelogData;
-    NetJob::Ptr dljob;
-    ChangelogType m_changelogType = CHANGELOG_MARKDOWN;
-};
diff --git a/launcher/ui/dialogs/UpdateDialog.ui b/launcher/ui/dialogs/UpdateDialog.ui
deleted file mode 100644
index 5eb9d88a..00000000
--- a/launcher/ui/dialogs/UpdateDialog.ui
+++ /dev/null
@@ -1,91 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<ui version="4.0">
- <class>UpdateDialog</class>
- <widget class="QDialog" name="UpdateDialog">
-  <property name="geometry">
-   <rect>
-    <x>0</x>
-    <y>0</y>
-    <width>657</width>
-    <height>673</height>
-   </rect>
-  </property>
-  <property name="windowTitle">
-   <string>Launcher Update</string>
-  </property>
-  <property name="windowIcon">
-   <iconset>
-    <normaloff>:/icons/toolbar/checkupdate</normaloff>:/icons/toolbar/checkupdate</iconset>
-  </property>
-  <layout class="QVBoxLayout" name="verticalLayout">
-   <item>
-    <layout class="QHBoxLayout" name="horizontalLayout_2">
-     <item>
-      <widget class="QLabel" name="label">
-       <property name="font">
-        <font>
-         <pointsize>14</pointsize>
-        </font>
-       </property>
-       <property name="text">
-        <string/>
-       </property>
-       <property name="alignment">
-        <set>Qt::AlignLeading|Qt::AlignLeft|Qt::AlignVCenter</set>
-       </property>
-       <property name="buddy">
-        <cstring>changelogBrowser</cstring>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-   <item>
-    <widget class="QTextBrowser" name="changelogBrowser">
-     <property name="openExternalLinks">
-      <bool>true</bool>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <layout class="QGridLayout" name="gridLayout">
-     <item row="0" column="0">
-      <widget class="QPushButton" name="btnUpdateNow">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
-       <property name="text">
-        <string>Update now</string>
-       </property>
-      </widget>
-     </item>
-     <item row="0" column="1">
-      <widget class="QPushButton" name="btnUpdateLater">
-       <property name="sizePolicy">
-        <sizepolicy hsizetype="Preferred" vsizetype="Fixed">
-         <horstretch>0</horstretch>
-         <verstretch>0</verstretch>
-        </sizepolicy>
-       </property>
-       <property name="text">
-        <string>Don't update yet</string>
-       </property>
-      </widget>
-     </item>
-    </layout>
-   </item>
-  </layout>
- </widget>
- <tabstops>
-  <tabstop>changelogBrowser</tabstop>
-  <tabstop>btnUpdateNow</tabstop>
-  <tabstop>btnUpdateLater</tabstop>
- </tabstops>
- <resources>
-  <include location="../../resources/multimc/multimc.qrc"/>
- </resources>
- <connections/>
-</ui>
diff --git a/launcher/ui/pages/global/LauncherPage.cpp b/launcher/ui/pages/global/LauncherPage.cpp
index cae0635f..a4c2755c 100644
--- a/launcher/ui/pages/global/LauncherPage.cpp
+++ b/launcher/ui/pages/global/LauncherPage.cpp
@@ -44,14 +44,13 @@
 #include <QTextCharFormat>
 #include <QMenuBar>
 
-#include "updater/UpdateChecker.h"
-
 #include "settings/SettingsObject.h"
 #include <FileSystem.h>
 #include "Application.h"
 #include "BuildConfig.h"
 #include "DesktopServices.h"
 #include "ui/themes/ITheme.h"
+#include "updater/ExternalUpdater.h"
 
 #include <QApplication>
 #include <QProcess>
@@ -80,30 +79,8 @@ LauncherPage::LauncherPage(QWidget *parent) : QWidget(parent), ui(new Ui::Launch
     m_languageModel = APPLICATION->translations();
     loadSettings();
 
-    if(BuildConfig.UPDATER_ENABLED)
-    {
-        QObject::connect(APPLICATION->updateChecker().get(), &UpdateChecker::channelListLoaded, this, &LauncherPage::refreshUpdateChannelList);
+    ui->updateSettingsBox->setHidden(!APPLICATION->updater());
 
-        if (APPLICATION->updateChecker()->hasChannels())
-        {
-            refreshUpdateChannelList();
-        }
-        else
-        {
-            APPLICATION->updateChecker()->updateChanList(false);
-        }
-
-        if (APPLICATION->updateChecker()->getExternalUpdater())
-        {
-            ui->updateChannelComboBox->setVisible(false);
-            ui->updateChannelDescLabel->setVisible(false);
-            ui->updateChannelLabel->setVisible(false);
-        }
-    }
-    else
-    {
-        ui->updateSettingsBox->setHidden(true);
-    }
     connect(ui->fontSizeBox, SIGNAL(valueChanged(int)), SLOT(refreshFontPreview()));
     connect(ui->consoleFont, SIGNAL(currentFontChanged(QFont)), SLOT(refreshFontPreview()));
 }
@@ -198,94 +175,16 @@ void LauncherPage::on_metadataDisableBtn_clicked()
     ui->metadataWarningLabel->setHidden(!ui->metadataDisableBtn->isChecked());
 }
 
-void LauncherPage::refreshUpdateChannelList()
-{
-    // Stop listening for selection changes. It's going to change a lot while we update it and
-    // we don't need to update the
-    // description label constantly.
-    QObject::disconnect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
-                        SLOT(updateChannelSelectionChanged(int)));
-
-    QList<UpdateChecker::ChannelListEntry> channelList = APPLICATION->updateChecker()->getChannelList();
-    ui->updateChannelComboBox->clear();
-    int selection = -1;
-    for (int i = 0; i < channelList.count(); i++)
-    {
-        UpdateChecker::ChannelListEntry entry = channelList.at(i);
-
-        // When it comes to selection, we'll rely on the indexes of a channel entry being the
-        // same in the
-        // combo box as it is in the update checker's channel list.
-        // This probably isn't very safe, but the channel list doesn't change often enough (or
-        // at all) for
-        // this to be a big deal. Hope it doesn't break...
-        ui->updateChannelComboBox->addItem(entry.name);
-
-        // If the update channel we just added was the selected one, set the current index in
-        // the combo box to it.
-        if (entry.id == m_currentUpdateChannel)
-        {
-            qDebug() << "Selected index" << i << "channel id" << m_currentUpdateChannel;
-            selection = i;
-        }
-    }
-
-    ui->updateChannelComboBox->setCurrentIndex(selection);
-
-    // Start listening for selection changes again and update the description label.
-    QObject::connect(ui->updateChannelComboBox, SIGNAL(currentIndexChanged(int)), this,
-                     SLOT(updateChannelSelectionChanged(int)));
-    refreshUpdateChannelDesc();
-
-    // Now that we've updated the channel list, we can enable the combo box.
-    // It starts off disabled so that if the channel list hasn't been loaded, it will be
-    // disabled.
-    ui->updateChannelComboBox->setEnabled(true);
-}
-
-void LauncherPage::updateChannelSelectionChanged(int index)
-{
-    refreshUpdateChannelDesc();
-}
-
-void LauncherPage::refreshUpdateChannelDesc()
-{
-    // Get the channel list.
-    QList<UpdateChecker::ChannelListEntry> channelList = APPLICATION->updateChecker()->getChannelList();
-    int selectedIndex = ui->updateChannelComboBox->currentIndex();
-    if (selectedIndex < 0)
-    {
-        return;
-    }
-    if (selectedIndex < channelList.count())
-    {
-        // Find the channel list entry with the given index.
-        UpdateChecker::ChannelListEntry selected = channelList.at(selectedIndex);
-
-        // Set the description text.
-        ui->updateChannelDescLabel->setText(selected.description);
-
-        // Set the currently selected channel ID.
-        m_currentUpdateChannel = selected.id;
-    }
-}
-
 void LauncherPage::applySettings()
 {
     auto s = APPLICATION->settings();
 
     // Updates
-    if (BuildConfig.UPDATER_ENABLED && APPLICATION->updateChecker()->getExternalUpdater())
-    {
-        APPLICATION->updateChecker()->getExternalUpdater()->setAutomaticallyChecksForUpdates(
-                ui->autoUpdateCheckBox->isChecked());
-    }
-    else
+    if (APPLICATION->updater())
     {
-        s->set("AutoUpdate", ui->autoUpdateCheckBox->isChecked());
+        APPLICATION->updater()->setAutomaticallyChecksForUpdates(ui->autoUpdateCheckBox->isChecked());
     }
 
-    s->set("UpdateChannel", m_currentUpdateChannel);
     auto original = s->get("IconTheme").toString();
     //FIXME: make generic
     switch (ui->themeComboBox->currentIndex())
@@ -390,17 +289,11 @@ void LauncherPage::loadSettings()
 {
     auto s = APPLICATION->settings();
     // Updates
-    if (BuildConfig.UPDATER_ENABLED && APPLICATION->updateChecker()->getExternalUpdater())
-    {
-        ui->autoUpdateCheckBox->setChecked(
-                APPLICATION->updateChecker()->getExternalUpdater()->getAutomaticallyChecksForUpdates());
-    }
-    else
+    if (APPLICATION->updater())
     {
-        ui->autoUpdateCheckBox->setChecked(s->get("AutoUpdate").toBool());
+        ui->autoUpdateCheckBox->setChecked(APPLICATION->updater()->getAutomaticallyChecksForUpdates());
     }
 
-    m_currentUpdateChannel = s->get("UpdateChannel").toString();
     //FIXME: make generic
     auto theme = s->get("IconTheme").toString();
     QStringList iconThemeOptions{"pe_colored", 
diff --git a/launcher/ui/pages/global/LauncherPage.h b/launcher/ui/pages/global/LauncherPage.h
index f38c922e..c60156c2 100644
--- a/launcher/ui/pages/global/LauncherPage.h
+++ b/launcher/ui/pages/global/LauncherPage.h
@@ -91,22 +91,10 @@ slots:
     void on_metadataDisableBtn_clicked();
 
     /*!
-     * Updates the list of update channels in the combo box.
-     */
-    void refreshUpdateChannelList();
-
-    /*!
-     * Updates the channel description label.
-     */
-    void refreshUpdateChannelDesc();
-
-    /*!
      * Updates the font preview
      */
     void refreshFontPreview();
 
-    void updateChannelSelectionChanged(int index);
-
 private:
     Ui::LauncherPage *ui;
 
diff --git a/launcher/ui/pages/global/LauncherPage.ui b/launcher/ui/pages/global/LauncherPage.ui
index c44718a1..fb36608d 100644
--- a/launcher/ui/pages/global/LauncherPage.ui
+++ b/launcher/ui/pages/global/LauncherPage.ui
@@ -58,33 +58,6 @@
             </property>
            </widget>
           </item>
-          <item>
-           <widget class="QLabel" name="updateChannelLabel">
-            <property name="text">
-             <string>Up&amp;date Channel:</string>
-            </property>
-            <property name="buddy">
-             <cstring>updateChannelComboBox</cstring>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QComboBox" name="updateChannelComboBox">
-            <property name="enabled">
-             <bool>false</bool>
-            </property>
-           </widget>
-          </item>
-          <item>
-           <widget class="QLabel" name="updateChannelDescLabel">
-            <property name="text">
-             <string>No channel selected.</string>
-            </property>
-            <property name="wordWrap">
-             <bool>true</bool>
-            </property>
-           </widget>
-          </item>
          </layout>
         </widget>
        </item>
@@ -573,7 +546,6 @@
  <tabstops>
   <tabstop>tabWidget</tabstop>
   <tabstop>autoUpdateCheckBox</tabstop>
-  <tabstop>updateChannelComboBox</tabstop>
   <tabstop>instDirTextBox</tabstop>
   <tabstop>instDirBrowseBtn</tabstop>
   <tabstop>modsDirTextBox</tabstop>
diff --git a/launcher/ui/pages/instance/LogPage.cpp b/launcher/ui/pages/instance/LogPage.cpp
index 31c3e925..9985f426 100644
--- a/launcher/ui/pages/instance/LogPage.cpp
+++ b/launcher/ui/pages/instance/LogPage.cpp
@@ -39,7 +39,7 @@
 
 #include "Application.h"
 
-#include <QIcon>
+#include <QIdentityProxyModel>
 #include <QScrollBar>
 #include <QShortcut>
 
diff --git a/launcher/ui/pages/instance/ScreenshotsPage.h b/launcher/ui/pages/instance/ScreenshotsPage.h
index c22706af..cdd53cc9 100644
--- a/launcher/ui/pages/instance/ScreenshotsPage.h
+++ b/launcher/ui/pages/instance/ScreenshotsPage.h
@@ -42,6 +42,7 @@
 
 class QFileSystemModel;
 class QIdentityProxyModel;
+class QItemSelection;
 namespace Ui
 {
 class ScreenshotsPage;
diff --git a/launcher/ui/pages/instance/ServersPage.cpp b/launcher/ui/pages/instance/ServersPage.cpp
index d64bcb76..a4f9f330 100644
--- a/launcher/ui/pages/instance/ServersPage.cpp
+++ b/launcher/ui/pages/instance/ServersPage.cpp
@@ -48,6 +48,7 @@
 
 #include <QFileSystemWatcher>
 #include <QMenu>
+#include <QTimer>
 
 static const int COLUMN_COUNT = 2; // 3 , TBD: latency and other nice things.
 
diff --git a/launcher/ui/pages/instance/WorldListPage.cpp b/launcher/ui/pages/instance/WorldListPage.cpp
index 85cc01ff..7819d077 100644
--- a/launcher/ui/pages/instance/WorldListPage.cpp
+++ b/launcher/ui/pages/instance/WorldListPage.cpp
@@ -43,9 +43,9 @@
 #include <QKeyEvent>
 #include <QClipboard>
 #include <QMessageBox>
+#include <QSortFilterProxyModel>
 #include <QTreeView>
 #include <QInputDialog>
-#include <QProcess>
 #include <Qt>
 
 #include "tools/MCEditTool.h"
diff --git a/launcher/ui/pages/modplatform/legacy_ftb/ListModel.cpp b/launcher/ui/pages/modplatform/legacy_ftb/ListModel.cpp
index 6b1f6b89..2343b79f 100644
--- a/launcher/ui/pages/modplatform/legacy_ftb/ListModel.cpp
+++ b/launcher/ui/pages/modplatform/legacy_ftb/ListModel.cpp
@@ -35,6 +35,8 @@
 
 #include "ListModel.h"
 #include "Application.h"
+#include "net/HttpMetaCache.h"
+#include "net/NetJob.h"
 
 #include "StringUtils.h"
 #include <Version.h>
diff --git a/launcher/ui/pages/modplatform/modrinth/ModrinthModel.h b/launcher/ui/pages/modplatform/modrinth/ModrinthModel.h
index 3be377a1..6e6be4b9 100644
--- a/launcher/ui/pages/modplatform/modrinth/ModrinthModel.h
+++ b/launcher/ui/pages/modplatform/modrinth/ModrinthModel.h
@@ -38,6 +38,7 @@
 #include <QAbstractListModel>
 
 #include "modplatform/modrinth/ModrinthPackManifest.h"
+#include "net/NetJob.h"
 #include "ui/pages/modplatform/modrinth/ModrinthPage.h"
 
 class ModPage;
diff --git a/launcher/updater/DownloadTask.cpp b/launcher/updater/DownloadTask.cpp
deleted file mode 100644
index 48fe767a..00000000
--- a/launcher/updater/DownloadTask.cpp
+++ /dev/null
@@ -1,177 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "DownloadTask.h"
-
-#include "updater/UpdateChecker.h"
-#include "GoUpdate.h"
-#include "net/NetJob.h"
-
-#include <QFile>
-#include <QTemporaryDir>
-#include <QCryptographicHash>
-
-namespace GoUpdate
-{
-
-DownloadTask::DownloadTask(
-    shared_qobject_ptr<QNetworkAccessManager> network,
-    Status status,
-    QString target,
-    QObject *parent
-) : Task(parent), m_updateFilesDir(target), m_network(network)
-{
-    m_status = status;
-
-    m_updateFilesDir.setAutoRemove(false);
-}
-
-void DownloadTask::executeTask()
-{
-    loadVersionInfo();
-}
-
-void DownloadTask::loadVersionInfo()
-{
-    setStatus(tr("Loading version information..."));
-
-    NetJob *netJob = new NetJob("Version Info", m_network);
-
-    // Find the index URL.
-    QUrl newIndexUrl = QUrl(m_status.newRepoUrl).resolved(QString::number(m_status.newVersionId) + ".json");
-    qDebug() << m_status.newRepoUrl << " turns into " << newIndexUrl;
-
-    netJob->addNetAction(m_newVersionFileListDownload = Net::Download::makeByteArray(newIndexUrl, &newVersionFileListData));
-
-    // If we have a current version URL, get that one too.
-    if (!m_status.currentRepoUrl.isEmpty())
-    {
-        QUrl cIndexUrl = QUrl(m_status.currentRepoUrl).resolved(QString::number(m_status.currentVersionId) + ".json");
-        netJob->addNetAction(m_currentVersionFileListDownload = Net::Download::makeByteArray(cIndexUrl, &currentVersionFileListData));
-        qDebug() << m_status.currentRepoUrl << " turns into " << cIndexUrl;
-    }
-
-    // connect signals and start the job
-    connect(netJob, &NetJob::succeeded, this, &DownloadTask::processDownloadedVersionInfo);
-    connect(netJob, &NetJob::failed, this, &DownloadTask::vinfoDownloadFailed);
-    m_vinfoNetJob.reset(netJob);
-    netJob->start();
-}
-
-void DownloadTask::vinfoDownloadFailed()
-{
-    // Something failed. We really need the second download (current version info), so parse
-    // downloads anyways as long as the first one succeeded.
-    if (m_newVersionFileListDownload->wasSuccessful())
-    {
-        processDownloadedVersionInfo();
-        return;
-    }
-
-    // TODO: Give a more detailed error message.
-    qCritical() << "Failed to download version info files.";
-    emitFailed(tr("Failed to download version info files."));
-}
-
-void DownloadTask::processDownloadedVersionInfo()
-{
-    VersionFileList m_currentVersionFileList;
-    VersionFileList m_newVersionFileList;
-
-    setStatus(tr("Reading file list for new version..."));
-    qDebug() << "Reading file list for new version...";
-    QString error;
-    if (!parseVersionInfo(newVersionFileListData, m_newVersionFileList, error))
-    {
-        qCritical() << error;
-        emitFailed(error);
-        return;
-    }
-
-    // if we have the current version info, use it.
-    if (m_currentVersionFileListDownload && m_currentVersionFileListDownload->wasSuccessful())
-    {
-        setStatus(tr("Reading file list for current version..."));
-        qDebug() << "Reading file list for current version...";
-        // if this fails, it's not a complete loss.
-        QString error;
-        if(!parseVersionInfo( currentVersionFileListData, m_currentVersionFileList, error))
-        {
-            qDebug() << error << "This is not a fatal error.";
-        }
-    }
-
-    // We don't need this any more.
-    m_currentVersionFileListDownload.reset();
-    m_newVersionFileListDownload.reset();
-    m_vinfoNetJob.reset();
-
-    setStatus(tr("Processing file lists - figuring out how to install the update..."));
-
-    // make a new netjob for the actual update files
-    NetJob::Ptr netJob = new NetJob("Update Files", m_network);
-
-    // fill netJob and operationList
-    if (!processFileLists(m_currentVersionFileList, m_newVersionFileList, m_status.rootPath, m_updateFilesDir.path(), netJob, m_operations))
-    {
-        emitFailed(tr("Failed to process update lists..."));
-        return;
-    }
-
-    // Now start the download.
-    QObject::connect(netJob.get(), &NetJob::succeeded, this, &DownloadTask::fileDownloadFinished);
-    QObject::connect(netJob.get(), &NetJob::progress, this, &DownloadTask::fileDownloadProgressChanged);
-    QObject::connect(netJob.get(), &NetJob::failed, this, &DownloadTask::fileDownloadFailed);
-
-    if(netJob->size() == 1) // Translation issues... see https://github.com/MultiMC/Launcher/issues/1701
-    {
-        setStatus(tr("Downloading one update file."));
-    }
-    else
-    {
-        setStatus(tr("Downloading %1 update files.").arg(QString::number(netJob->size())));
-    }
-    qDebug() << "Begin downloading update files to" << m_updateFilesDir.path();
-    m_filesNetJob = netJob;
-    m_filesNetJob->start();
-}
-
-void DownloadTask::fileDownloadFinished()
-{
-    emitSucceeded();
-}
-
-void DownloadTask::fileDownloadFailed(QString reason)
-{
-    qCritical() << "Failed to download update files:" << reason;
-    emitFailed(tr("Failed to download update files: %1").arg(reason));
-}
-
-void DownloadTask::fileDownloadProgressChanged(qint64 current, qint64 total)
-{
-    setProgress(current, total);
-}
-
-QString DownloadTask::updateFilesDir()
-{
-    return m_updateFilesDir.path();
-}
-
-OperationList DownloadTask::operations()
-{
-    return m_operations;
-}
-
-}
diff --git a/launcher/updater/DownloadTask.h b/launcher/updater/DownloadTask.h
deleted file mode 100644
index 19a6265c..00000000
--- a/launcher/updater/DownloadTask.h
+++ /dev/null
@@ -1,100 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include "tasks/Task.h"
-#include "net/NetJob.h"
-#include "GoUpdate.h"
-
-namespace GoUpdate
-{
-/*!
- * The DownloadTask is a task that takes a given version ID and repository URL,
- * downloads that version's files from the repository, and prepares to install them.
- */
-class DownloadTask : public Task
-{
-    Q_OBJECT
-
-public:
-    /**
-     * Create a download task
-     *
-     * target is a template - XXXXXX at the end will be replaced with a random generated string, ensuring uniqueness
-     */
-    explicit DownloadTask(shared_qobject_ptr<QNetworkAccessManager> network, Status status, QString target, QObject* parent = 0);
-    virtual ~DownloadTask() {};
-
-    /// Get the directory that will contain the update files.
-    QString updateFilesDir();
-
-    /// Get the list of operations that should be done
-    OperationList operations();
-
-    /// set updater download behavior
-    void setUseLocalUpdater(bool useLocal);
-
-protected:
-    //! Entry point for tasks.
-    virtual void executeTask() override;
-
-    /*!
-     * Downloads the version info files from the repository.
-     * The files for both the current build, and the build that we're updating to need to be downloaded.
-     * If the current version's info file can't be found, Prism Launcher will not delete files that
-     * were removed between versions. It will still replace files that have changed, however.
-     * Note that although the repository URL for the current version is not given to the update task,
-     * the task will attempt to look it up in the UpdateChecker's channel list.
-     * If an error occurs here, the function will call emitFailed and return false.
-     */
-    void loadVersionInfo();
-
-    NetJob::Ptr m_vinfoNetJob;
-    QByteArray currentVersionFileListData;
-    QByteArray newVersionFileListData;
-    Net::Download::Ptr m_currentVersionFileListDownload;
-    Net::Download::Ptr m_newVersionFileListDownload;
-
-    NetJob::Ptr m_filesNetJob;
-
-    Status m_status;
-
-    OperationList m_operations;
-
-    /*!
-     * Temporary directory to store update files in.
-     * This will be set to not auto delete. Task will fail if this fails to be created.
-     */
-    QTemporaryDir m_updateFilesDir;
-
-protected slots:
-    /*!
-     * This function is called when version information is finished downloading
-     * and at least the new file list download succeeded
-     */
-    void processDownloadedVersionInfo();
-    void vinfoDownloadFailed();
-
-    void fileDownloadFinished();
-    void fileDownloadFailed(QString reason);
-    void fileDownloadProgressChanged(qint64 current, qint64 total);
-
-private:
-    shared_qobject_ptr<QNetworkAccessManager> m_network;
-};
-
-}
-
diff --git a/launcher/updater/GoUpdate.cpp b/launcher/updater/GoUpdate.cpp
deleted file mode 100644
index 4bc7dfa9..00000000
--- a/launcher/updater/GoUpdate.cpp
+++ /dev/null
@@ -1,198 +0,0 @@
-#include "GoUpdate.h"
-#include <QDebug>
-#include <QDomDocument>
-#include <QFile>
-#include <FileSystem.h>
-
-#include "net/Download.h"
-#include "net/ChecksumValidator.h"
-
-namespace GoUpdate
-{
-
-bool parseVersionInfo(const QByteArray &data, VersionFileList &list, QString &error)
-{
-    QJsonParseError jsonError;
-    QJsonDocument jsonDoc = QJsonDocument::fromJson(data, &jsonError);
-    if (jsonError.error != QJsonParseError::NoError)
-    {
-        error = QString("Failed to parse version info JSON: %1 at %2")
-                    .arg(jsonError.errorString())
-                    .arg(jsonError.offset);
-        qCritical() << error;
-        return false;
-    }
-
-    QJsonObject json = jsonDoc.object();
-
-    qDebug() << data;
-    qDebug() << "Loading version info from JSON.";
-    QJsonArray filesArray = json.value("Files").toArray();
-    for (QJsonValue fileValue : filesArray)
-    {
-        QJsonObject fileObj = fileValue.toObject();
-
-        QString file_path = fileObj.value("Path").toString();
-
-        VersionFileEntry file{file_path,        fileObj.value("Perms").toVariant().toInt(),
-                              FileSourceList(), fileObj.value("MD5").toString(), };
-        qDebug() << "File" << file.path << "with perms" << file.mode;
-
-        QJsonArray sourceArray = fileObj.value("Sources").toArray();
-        for (QJsonValue val : sourceArray)
-        {
-            QJsonObject sourceObj = val.toObject();
-
-            QString type = sourceObj.value("SourceType").toString();
-            if (type == "http")
-            {
-                file.sources.append(FileSource("http", sourceObj.value("Url").toString()));
-            }
-            else
-            {
-                qWarning() << "Unknown source type" << type << "ignored.";
-            }
-        }
-
-        qDebug() << "Loaded info for" << file.path;
-
-        list.append(file);
-    }
-
-    return true;
-}
-
-bool processFileLists
-(
-    const VersionFileList &currentVersion,
-    const VersionFileList &newVersion,
-    const QString &rootPath,
-    const QString &tempPath,
-    NetJob::Ptr job,
-    OperationList &ops
-)
-{
-    // First, if we've loaded the current version's file list, we need to iterate through it and
-    // delete anything in the current one version's list that isn't in the new version's list.
-    for (VersionFileEntry entry : currentVersion)
-    {
-        QFileInfo toDelete(FS::PathCombine(rootPath, entry.path));
-        if (!toDelete.exists())
-        {
-            qCritical() << "Expected file " << toDelete.absoluteFilePath()
-                         << " doesn't exist!";
-        }
-        bool keep = false;
-
-        //
-        for (VersionFileEntry newEntry : newVersion)
-        {
-            if (newEntry.path == entry.path)
-            {
-                qDebug() << "Not deleting" << entry.path
-                             << "because it is still present in the new version.";
-                keep = true;
-                break;
-            }
-        }
-
-        // If the loop reaches the end and we didn't find a match, delete the file.
-        if (!keep)
-        {
-            if (toDelete.exists())
-                ops.append(Operation::DeleteOp(entry.path));
-        }
-    }
-
-    // Next, check each file in Prism Launcher's folder and see if we need to update them.
-    for (VersionFileEntry entry : newVersion)
-    {
-        // TODO: Let's not MD5sum a ton of files on the GUI thread. We should probably find a
-        // way to do this in the background.
-        QString fileMD5;
-        QString realEntryPath = FS::PathCombine(rootPath, entry.path);
-        QFile entryFile(realEntryPath);
-        QFileInfo entryInfo(realEntryPath);
-
-        bool needs_upgrade = false;
-        if (!entryFile.exists())
-        {
-            needs_upgrade = true;
-        }
-        else
-        {
-            bool pass = true;
-            if (!entryInfo.isReadable())
-            {
-                qCritical() << "File " << realEntryPath << " is not readable.";
-                pass = false;
-            }
-            if (!entryInfo.isWritable())
-            {
-                qCritical() << "File " << realEntryPath << " is not writable.";
-                pass = false;
-            }
-            if (!entryFile.open(QFile::ReadOnly))
-            {
-                qCritical() << "File " << realEntryPath << " cannot be opened for reading.";
-                pass = false;
-            }
-            if (!pass)
-            {
-                ops.clear();
-                return false;
-            }
-        }
-
-        if(!needs_upgrade)
-        {
-            QCryptographicHash hash(QCryptographicHash::Md5);
-            auto foo = entryFile.readAll();
-
-            hash.addData(foo);
-            fileMD5 = hash.result().toHex();
-            if ((fileMD5 != entry.md5))
-            {
-                qDebug() << "MD5Sum does not match!";
-                qDebug() << "Expected:'" << entry.md5 << "'";
-                qDebug() << "Got:     '" << fileMD5 << "'";
-                needs_upgrade = true;
-            }
-        }
-
-        // skip file. it doesn't need an upgrade.
-        if (!needs_upgrade)
-        {
-            qDebug() << "File" << realEntryPath << " does not need updating.";
-            continue;
-        }
-
-        // yep. this file actually needs an upgrade. PROCEED.
-        qDebug() << "Found file" << realEntryPath << " that needs updating.";
-
-        // Go through the sources list and find one to use.
-        // TODO: Make a NetAction that takes a source list and tries each of them until one
-        // works. For now, we'll just use the first http one.
-        for (FileSource source : entry.sources)
-        {
-            if (source.type != "http")
-                continue;
-
-            qDebug() << "Will download" << entry.path << "from" << source.url;
-
-            // Download it to updatedir/<filepath>-<md5> where filepath is the file's
-            // path with slashes replaced by underscores.
-            QString dlPath = FS::PathCombine(tempPath, QString(entry.path).replace("/", "_"));
-
-            // We need to download the file to the updatefiles folder and add a task
-            // to copy it to its install path.
-            auto download = Net::Download::makeFile(source.url, dlPath);
-            auto rawMd5 = QByteArray::fromHex(entry.md5.toLatin1());
-            download->addValidator(new Net::ChecksumValidator(QCryptographicHash::Md5, rawMd5));
-            job->addNetAction(download);
-            ops.append(Operation::CopyOp(dlPath, entry.path, entry.mode));
-        }
-    }
-    return true;
-}
-}
diff --git a/launcher/updater/GoUpdate.h b/launcher/updater/GoUpdate.h
deleted file mode 100644
index 46a679ef..00000000
--- a/launcher/updater/GoUpdate.h
+++ /dev/null
@@ -1,125 +0,0 @@
-#pragma once
-#include <QByteArray>
-#include <net/NetJob.h>
-
-namespace GoUpdate
-{
-
-/**
- * A temporary object exchanged between updated checker and the actual update task
- */
-struct Status
-{
-    bool updateAvailable = false;
-
-    int newVersionId = -1;
-    QString newRepoUrl;
-
-    int currentVersionId = -1;
-    QString currentRepoUrl;
-
-    // path to the root of the application
-    QString rootPath;
-};
-
-/**
- * Struct that describes an entry in a VersionFileEntry's `Sources` list.
- */
-struct FileSource
-{
-    FileSource(QString type, QString url, QString compression="")
-    {
-        this->type = type;
-        this->url = url;
-        this->compressionType = compression;
-    }
-
-    bool operator==(const FileSource &f2) const
-    {
-        return type == f2.type && url == f2.url && compressionType == f2.compressionType;
-    }
-
-    QString type;
-    QString url;
-    QString compressionType;
-};
-typedef QList<FileSource> FileSourceList;
-
-/**
- * Structure that describes an entry in a GoUpdate version's `Files` list.
- */
-struct VersionFileEntry
-{
-    QString path;
-    int mode;
-    FileSourceList sources;
-    QString md5;
-    bool operator==(const VersionFileEntry &v2) const
-    {
-        return path == v2.path && mode == v2.mode && sources == v2.sources && md5 == v2.md5;
-    }
-};
-typedef QList<VersionFileEntry> VersionFileList;
-
-/**
- * Structure that describes an operation to perform when installing updates.
- */
-struct Operation
-{
-    static Operation CopyOp(QString from, QString to, int fmode=0644)
-    {
-        return Operation{OP_REPLACE, from, to, fmode};
-    }
-    static Operation DeleteOp(QString file)
-    {
-        return Operation{OP_DELETE, QString(), file, 0644};
-    }
-
-    // FIXME: for some types, some of the other fields are irrelevant!
-    bool operator==(const Operation &u2) const
-    {
-        return type == u2.type &&
-            source == u2.source &&
-            destination == u2.destination &&
-            destinationMode == u2.destinationMode;
-    }
-
-    //! Specifies the type of operation that this is.
-    enum Type
-    {
-        OP_REPLACE,
-        OP_DELETE,
-    } type;
-
-    //! The source file, if any
-    QString source;
-
-    //! The destination file.
-    QString destination;
-
-    //! The mode to change the destination file to.
-    int destinationMode;
-};
-typedef QList<Operation> OperationList;
-
-/**
- * Loads the file list from the given version info JSON object into the given list.
- */
-bool parseVersionInfo(const QByteArray &data, VersionFileList& list, QString &error);
-
-/*!
- * Takes a list of file entries for the current version's files and the new version's files
- * and populates the downloadList and operationList with information about how to download and install the update.
- */
-bool processFileLists
-(
-    const VersionFileList &currentVersion,
-    const VersionFileList &newVersion,
-    const QString &rootPath,
-    const QString &tempPath,
-    NetJob::Ptr job,
-    OperationList &ops
-);
-
-}
-Q_DECLARE_METATYPE(GoUpdate::Status)
diff --git a/launcher/updater/MacSparkleUpdater.h b/launcher/updater/MacSparkleUpdater.h
index d50dbd68..cee19f7c 100644
--- a/launcher/updater/MacSparkleUpdater.h
+++ b/launcher/updater/MacSparkleUpdater.h
@@ -119,8 +119,6 @@ private:
     class Private;
 
     Private *priv;
-
-    void loadChannelsFromSettings();
 };
 
 #endif //LAUNCHER_MACSPARKLEUPDATER_H
diff --git a/launcher/updater/MacSparkleUpdater.mm b/launcher/updater/MacSparkleUpdater.mm
index ca6da55a..07337176 100644
--- a/launcher/updater/MacSparkleUpdater.mm
+++ b/launcher/updater/MacSparkleUpdater.mm
@@ -106,8 +106,6 @@ MacSparkleUpdater::MacSparkleUpdater()
     priv->updaterObserver.callback = ^(bool canCheck) {
         emit canCheckForUpdatesChanged(canCheck);
     };
-
-    loadChannelsFromSettings();
 }
 
 MacSparkleUpdater::~MacSparkleUpdater()
@@ -165,7 +163,6 @@ void MacSparkleUpdater::setUpdateCheckInterval(double seconds)
 void MacSparkleUpdater::clearAllowedChannels()
 {
     priv->updaterDelegate.allowedChannels = [NSSet set];
-    APPLICATION->settings()->set("UpdateChannel", "");
 }
 
 void MacSparkleUpdater::setAllowedChannel(const QString &channel)
@@ -178,7 +175,6 @@ void MacSparkleUpdater::setAllowedChannel(const QString &channel)
 
     NSSet<NSString *> *nsChannels = [NSSet setWithObject:channel.toNSString()];
     priv->updaterDelegate.allowedChannels = nsChannels;
-    APPLICATION->settings()->set("UpdateChannel", channel);
 }
 
 void MacSparkleUpdater::setAllowedChannels(const QSet<QString> &channels)
@@ -199,7 +195,6 @@ void MacSparkleUpdater::setAllowedChannels(const QSet<QString> &channels)
     }
 
     priv->updaterDelegate.allowedChannels = nsChannels;
-    APPLICATION->settings()->set("UpdateChannel", channelsConfig.trimmed());
 }
 
 void MacSparkleUpdater::setBetaAllowed(bool allowed)
@@ -213,10 +208,3 @@ void MacSparkleUpdater::setBetaAllowed(bool allowed)
         clearAllowedChannels();
     }
 }
-
-void MacSparkleUpdater::loadChannelsFromSettings()
-{
-    QStringList channelList = APPLICATION->settings()->get("UpdateChannel").toString().split(" ");
-    QSet<QString> channels(channelList.begin(), channelList.end());
-    setAllowedChannels(channels);
-}
diff --git a/launcher/updater/UpdateChecker.cpp b/launcher/updater/UpdateChecker.cpp
deleted file mode 100644
index 78d979ff..00000000
--- a/launcher/updater/UpdateChecker.cpp
+++ /dev/null
@@ -1,296 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "UpdateChecker.h"
-
-#include <QJsonObject>
-#include <QJsonArray>
-#include <QJsonValue>
-#include <QDebug>
-
-#define API_VERSION 0
-#define CHANLIST_FORMAT 0
-
-#include "BuildConfig.h"
-
-UpdateChecker::UpdateChecker(shared_qobject_ptr<QNetworkAccessManager> nam, QString channelUrl, QString currentChannel)
-{
-    m_network = nam;
-    m_channelUrl = channelUrl;
-    m_currentChannel = currentChannel;
-
-#ifdef Q_OS_MAC
-    m_externalUpdater = new MacSparkleUpdater();
-#endif
-}
-
-QList<UpdateChecker::ChannelListEntry> UpdateChecker::getChannelList() const
-{
-    return m_channels;
-}
-
-bool UpdateChecker::hasChannels() const
-{
-    return !m_channels.isEmpty();
-}
-
-ExternalUpdater* UpdateChecker::getExternalUpdater()
-{
-    return m_externalUpdater;
-}
-
-void UpdateChecker::checkForUpdate(const QString& updateChannel, bool notifyNoUpdate)
-{
-    if (m_externalUpdater)
-    {
-        m_externalUpdater->setBetaAllowed(updateChannel == "beta");
-        if (notifyNoUpdate)
-        {
-            qDebug() << "Checking for updates.";
-            m_externalUpdater->checkForUpdates();
-        } else
-        {
-            // The updater library already handles automatic update checks.
-            return;
-        }
-    }
-    else
-    {
-        qDebug() << "Checking for updates.";
-        // If the channel list hasn't loaded yet, load it and defer checking for updates until
-        // later.
-        if (!m_chanListLoaded)
-        {
-            qDebug() << "Channel list isn't loaded yet. Loading channel list and deferring update check.";
-            m_checkUpdateWaiting = true;
-            m_deferredUpdateChannel = updateChannel;
-            updateChanList(notifyNoUpdate);
-            return;
-        }
-
-        if (m_updateChecking)
-        {
-            qDebug() << "Ignoring update check request. Already checking for updates.";
-            return;
-        }
-
-        // Find the desired channel within the channel list and get its repo URL. If if cannot be
-        // found, error.
-        QString stableUrl;
-        m_newRepoUrl = "";
-        for (ChannelListEntry entry: m_channels)
-        {
-            qDebug() << "channelEntry = " << entry.id;
-            if (entry.id == "stable")
-            {
-                stableUrl = entry.url;
-            }
-            if (entry.id == updateChannel)
-            {
-                m_newRepoUrl = entry.url;
-                qDebug() << "is intended update channel: " << entry.id;
-            }
-            if (entry.id == m_currentChannel)
-            {
-                m_currentRepoUrl = entry.url;
-                qDebug() << "is current update channel: " << entry.id;
-            }
-        }
-
-        qDebug() << "m_repoUrl = " << m_newRepoUrl;
-
-        if (m_newRepoUrl.isEmpty())
-        {
-            qWarning() << "m_repoUrl was empty. defaulting to 'stable': " << stableUrl;
-            m_newRepoUrl = stableUrl;
-        }
-
-        // If nothing applies, error
-        if (m_newRepoUrl.isEmpty())
-        {
-            qCritical() << "failed to select any update repository for: " << updateChannel;
-            emit updateCheckFailed();
-            return;
-        }
-
-        m_updateChecking = true;
-
-        QUrl indexUrl = QUrl(m_newRepoUrl).resolved(QUrl("index.json"));
-
-        indexJob = new NetJob("GoUpdate Repository Index", m_network);
-        indexJob->addNetAction(Net::Download::makeByteArray(indexUrl, &indexData));
-        connect(indexJob.get(), &NetJob::succeeded, [this, notifyNoUpdate]() { updateCheckFinished(notifyNoUpdate); });
-        connect(indexJob.get(), &NetJob::failed, this, &UpdateChecker::updateCheckFailed);
-        indexJob->start();
-    }
-}
-
-void UpdateChecker::updateCheckFinished(bool notifyNoUpdate)
-{
-    qDebug() << "Finished downloading repo index. Checking for new versions.";
-
-    QJsonParseError jsonError;
-    indexJob.reset();
-
-    QJsonDocument jsonDoc = QJsonDocument::fromJson(indexData, &jsonError);
-    indexData.clear();
-    if (jsonError.error != QJsonParseError::NoError || !jsonDoc.isObject())
-    {
-        qCritical() << "Failed to parse GoUpdate repository index. JSON error"
-                     << jsonError.errorString() << "at offset" << jsonError.offset;
-        m_updateChecking = false;
-        return;
-    }
-
-    QJsonObject object = jsonDoc.object();
-
-    bool success = false;
-    int apiVersion = object.value("ApiVersion").toVariant().toInt(&success);
-    if (apiVersion != API_VERSION || !success)
-    {
-        qCritical() << "Failed to check for updates. API version mismatch. We're using"
-                     << API_VERSION << "server has" << apiVersion;
-        m_updateChecking = false;
-        return;
-    }
-
-    qDebug() << "Processing repository version list.";
-    QJsonObject newestVersion;
-    QJsonArray versions = object.value("Versions").toArray();
-    for (QJsonValue versionVal : versions)
-    {
-        QJsonObject version = versionVal.toObject();
-        if (newestVersion.value("Id").toVariant().toInt() <
-            version.value("Id").toVariant().toInt())
-        {
-            newestVersion = version;
-        }
-    }
-
-    // We've got the version with the greatest ID number. Now compare it to our current build
-    // number and update if they're different.
-    int newBuildNumber = newestVersion.value("Id").toVariant().toInt();
-    if (newBuildNumber != m_currentBuild)
-    {
-        qDebug() << "Found newer version with ID" << newBuildNumber;
-        // Update!
-        GoUpdate::Status updateStatus;
-        updateStatus.updateAvailable = true;
-        updateStatus.currentVersionId = m_currentBuild;
-        updateStatus.currentRepoUrl = m_currentRepoUrl;
-        updateStatus.newVersionId = newBuildNumber;
-        updateStatus.newRepoUrl = m_newRepoUrl;
-        emit updateAvailable(updateStatus);
-    }
-    else if (notifyNoUpdate)
-    {
-        emit noUpdateFound();
-    }
-    m_updateChecking = false;
-}
-
-void UpdateChecker::updateCheckFailed()
-{
-    qCritical() << "Update check failed for reasons unknown.";
-}
-
-void UpdateChecker::updateChanList(bool notifyNoUpdate)
-{
-    qDebug() << "Loading the channel list.";
-
-    if (m_chanListLoading)
-    {
-        qDebug() << "Ignoring channel list update request. Already grabbing channel list.";
-        return;
-    }
-
-    m_chanListLoading = true;
-    chanListJob = new NetJob("Update System Channel List", m_network);
-    chanListJob->addNetAction(Net::Download::makeByteArray(QUrl(m_channelUrl), &chanlistData));
-    connect(chanListJob.get(), &NetJob::succeeded, [this, notifyNoUpdate]() { chanListDownloadFinished(notifyNoUpdate); });
-    connect(chanListJob.get(), &NetJob::failed, this, &UpdateChecker::chanListDownloadFailed);
-    chanListJob->start();
-}
-
-void UpdateChecker::chanListDownloadFinished(bool notifyNoUpdate)
-{
-    chanListJob.reset();
-
-    QJsonParseError jsonError;
-    QJsonDocument jsonDoc = QJsonDocument::fromJson(chanlistData, &jsonError);
-    chanlistData.clear();
-    if (jsonError.error != QJsonParseError::NoError)
-    {
-        // TODO: Report errors to the user.
-        qCritical() << "Failed to parse channel list JSON:" << jsonError.errorString() << "at" << jsonError.offset;
-        m_chanListLoading = false;
-        return;
-    }
-
-    QJsonObject object = jsonDoc.object();
-
-    bool success = false;
-    int formatVersion = object.value("format_version").toVariant().toInt(&success);
-    if (formatVersion != CHANLIST_FORMAT || !success)
-    {
-        qCritical()
-            << "Failed to check for updates. Channel list format version mismatch. We're using"
-            << CHANLIST_FORMAT << "server has" << formatVersion;
-        m_chanListLoading = false;
-        return;
-    }
-
-    // Load channels into a temporary array.
-    QList<ChannelListEntry> loadedChannels;
-    QJsonArray channelArray = object.value("channels").toArray();
-    for (QJsonValue chanVal : channelArray)
-    {
-        QJsonObject channelObj = chanVal.toObject();
-        ChannelListEntry entry {
-            channelObj.value("id").toVariant().toString(),
-            channelObj.value("name").toVariant().toString(),
-            channelObj.value("description").toVariant().toString(),
-            channelObj.value("url").toVariant().toString()
-        };
-        if (entry.id.isEmpty() || entry.name.isEmpty() || entry.url.isEmpty())
-        {
-            qCritical() << "Channel list entry with empty ID, name, or URL. Skipping.";
-            continue;
-        }
-        loadedChannels.append(entry);
-    }
-
-    // Swap  the channel list we just loaded into the object's channel list.
-    m_channels.swap(loadedChannels);
-
-    m_chanListLoading = false;
-    m_chanListLoaded = true;
-    qDebug() << "Successfully loaded UpdateChecker channel list.";
-
-    // If we're waiting to check for updates, do that now.
-    if (m_checkUpdateWaiting) {
-        checkForUpdate(m_deferredUpdateChannel, notifyNoUpdate);
-    }
-
-    emit channelListLoaded();
-}
-
-void UpdateChecker::chanListDownloadFailed(QString reason)
-{
-    m_chanListLoading = false;
-    qCritical() << QString("Failed to download channel list: %1").arg(reason);
-    emit channelListLoaded();
-}
-
diff --git a/launcher/updater/UpdateChecker.h b/launcher/updater/UpdateChecker.h
deleted file mode 100644
index 42ef318b..00000000
--- a/launcher/updater/UpdateChecker.h
+++ /dev/null
@@ -1,140 +0,0 @@
-/* Copyright 2013-2021 MultiMC Contributors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#pragma once
-
-#include "net/NetJob.h"
-#include "GoUpdate.h"
-#include "ExternalUpdater.h"
-
-#ifdef Q_OS_MAC
-#include "MacSparkleUpdater.h"
-#endif
-
-class UpdateChecker : public QObject
-{
-    Q_OBJECT
-
-public:
-    UpdateChecker(shared_qobject_ptr<QNetworkAccessManager> nam, QString channelUrl, QString currentChannel);
-    void checkForUpdate(const QString& updateChannel, bool notifyNoUpdate);
-
-    /*!
-     * Causes the update checker to download the channel list from the URL specified in config.h (generated by CMake).
-     * If this isn't called before checkForUpdate(), it will automatically be called.
-     */
-    void updateChanList(bool notifyNoUpdate);
-
-    /*!
-     * An entry in the channel list.
-     */
-    struct ChannelListEntry
-    {
-        QString id;
-        QString name;
-        QString description;
-        QString url;
-    };
-
-    /*!
-     * Returns a the current channel list.
-     * If the channel list hasn't been loaded, this list will be empty.
-     */
-    QList<ChannelListEntry> getChannelList() const;
-
-    /*!
-     * Returns false if the channel list is empty.
-     */
-    bool hasChannels() const;
-
-    /*!
-     * Returns a pointer to an object that controls the external updater, or nullptr if an external updater is not used.
-     */
-    ExternalUpdater *getExternalUpdater();
-
-signals:
-    //! Signal emitted when an update is available. Passes the URL for the repo and the ID and name for the version.
-    void updateAvailable(GoUpdate::Status status);
-
-    //! Signal emitted when the channel list finishes loading or fails to load.
-    void channelListLoaded();
-
-    void noUpdateFound();
-
-private slots:
-    void updateCheckFinished(bool notifyNoUpdate);
-    void updateCheckFailed();
-
-    void chanListDownloadFinished(bool notifyNoUpdate);
-    void chanListDownloadFailed(QString reason);
-
-private:
-    friend class UpdateCheckerTest;
-
-    shared_qobject_ptr<QNetworkAccessManager> m_network;
-
-    NetJob::Ptr indexJob;
-    QByteArray indexData;
-    NetJob::Ptr chanListJob;
-    QByteArray chanlistData;
-
-    QString m_channelUrl;
-
-    QList<ChannelListEntry> m_channels;
-
-    /*!
-     * True while the system is checking for updates.
-     * If checkForUpdate is called while this is true, it will be ignored.
-     */
-    bool m_updateChecking = false;
-
-    /*!
-     * True if the channel list has loaded.
-     * If this is false, trying to check for updates will call updateChanList first.
-     */
-    bool m_chanListLoaded = false;
-
-    /*!
-     * Set to true while the channel list is currently loading.
-     */
-    bool m_chanListLoading = false;
-
-    /*!
-     * Set to true when checkForUpdate is called while the channel list isn't loaded.
-     * When the channel list finishes loading, if this is true, the update checker will check for updates.
-     */
-    bool m_checkUpdateWaiting = false;
-
-    /*!
-     * if m_checkUpdateWaiting, this is the last used update channel
-     */
-    QString m_deferredUpdateChannel;
-
-    int m_currentBuild = -1;
-    QString m_currentChannel;
-    QString m_currentRepoUrl;
-
-    QString m_newRepoUrl;
-
-    /*!
-     * If not a nullptr, then the updater here will be used instead of the old updater that uses GoUpdate when
-     * checking for updates.
-     *
-     * As a result, signals from this class won't be emitted, and most of the functions in this class other
-     * than checkForUpdate are not useful. Call functions from this external updater object instead.
-     */
-    ExternalUpdater *m_externalUpdater = nullptr;
-};
-