diff --git a/launcher/CMakeLists.txt b/launcher/CMakeLists.txt
index 2313f0e4..3c9aee6a 100644
--- a/launcher/CMakeLists.txt
+++ b/launcher/CMakeLists.txt
@@ -850,6 +850,8 @@ SET(LAUNCHER_SOURCES
     ui/dialogs/ScrollMessageBox.h
     ui/dialogs/ChooseProviderDialog.h
     ui/dialogs/ChooseProviderDialog.cpp
+    ui/dialogs/ModUpdateDialog.cpp
+    ui/dialogs/ModUpdateDialog.h
 
     # GUI - widgets
     ui/widgets/Common.cpp
diff --git a/launcher/modplatform/flame/FlameCheckUpdate.cpp b/launcher/modplatform/flame/FlameCheckUpdate.cpp
index f1983fa4..12d99029 100644
--- a/launcher/modplatform/flame/FlameCheckUpdate.cpp
+++ b/launcher/modplatform/flame/FlameCheckUpdate.cpp
@@ -74,16 +74,13 @@ void FlameCheckUpdate::executeTask()
     setStatus(tr("Preparing mods for CurseForge..."));
     setProgress(0, 5);
 
-    QHash<QString, Mod> mappings;
+    QHash<int, Mod> mappings;
 
     // Create all hashes
-    QStringList hashes;
     std::list<uint> murmur_hashes;
 
     auto best_hash_type = ProviderCaps.hashType(ModPlatform::Provider::FLAME).first();
     for (auto mod : m_mods) {
-        auto hash = mod.metadata()->hash;
-
         QByteArray jar_data;
 
         try {
@@ -106,14 +103,7 @@ void FlameCheckUpdate::executeTask()
         auto murmur_hash = MurmurHash2(jar_data_treated, jar_data_treated.length());
         murmur_hashes.emplace_back(murmur_hash);
 
-        // Sadly the API can only handle one hash type per call, se we
-        // need to generate a new hash if the current one is innadequate
-        // (though it will rarely happen, if at all)
-        if (mod.metadata()->hash_format != best_hash_type)
-            hash = QString(ProviderCaps.hash(ModPlatform::Provider::FLAME, jar_data, best_hash_type).toHex());
-
-        hashes.append(hash);
-        mappings.insert(hash, mod);
+        mappings.insert(mod.metadata()->mod_id().toInt(), mod);
     }
 
     auto* response = new QByteArray();
@@ -154,9 +144,10 @@ void FlameCheckUpdate::executeTask()
                     return;
                 }
 
-                auto mod_iter = mappings.find(current_ver.hash);
+                auto mod_iter = mappings.find(current_ver.addonId.toInt());
                 if (mod_iter == mappings.end()) {
                     qCritical() << "Failed to remap mod from Flame!";
+                    qDebug() << match_obj;
                     continue;
                 }
 
@@ -191,7 +182,7 @@ void FlameCheckUpdate::executeTask()
                     continue;
                 }
 
-                if (!latest_ver.hash.isEmpty() && current_ver.hash != latest_ver.hash) {
+                if (!latest_ver.hash.isEmpty() && (current_ver.hash != latest_ver.hash || mod.status() == ModStatus::NotInstalled)) {
                     // Fake pack with the necessary info to pass to the download task :)
                     ModPlatform::IndexedPack pack;
                     pack.name = mod.name();
diff --git a/launcher/modplatform/modrinth/ModrinthCheckUpdate.cpp b/launcher/modplatform/modrinth/ModrinthCheckUpdate.cpp
index 81a2652a..981c4216 100644
--- a/launcher/modplatform/modrinth/ModrinthCheckUpdate.cpp
+++ b/launcher/modplatform/modrinth/ModrinthCheckUpdate.cpp
@@ -81,11 +81,14 @@ void ModrinthCheckUpdate::executeTask()
         try {
             for (auto hash : mappings.keys()) {
                 auto project_obj = doc[hash].toObject();
+
+                // If the returned project is empty, but we have Modrinth metadata,
+                // it means this specific version is not available
                 if (project_obj.isEmpty()) {
                     qDebug() << "Mod " << mappings.find(hash).value().name() << " got an empty response.";
                     qDebug() << "Hash: " << hash;
 
-                    emit checkFailed(mappings.find(hash).value(), tr("Couldn't find mod in Modrinth"));
+                    emit checkFailed(mappings.find(hash).value(), tr("Couldn't find the latest version of this mod with the correct mod loader and game version."));
 
                     continue;
                 }
diff --git a/launcher/ui/dialogs/ModUpdateDialog.cpp b/launcher/ui/dialogs/ModUpdateDialog.cpp
new file mode 100644
index 00000000..b60fd304
--- /dev/null
+++ b/launcher/ui/dialogs/ModUpdateDialog.cpp
@@ -0,0 +1,317 @@
+#include "ModUpdateDialog.h"
+#include "ChooseProviderDialog.h"
+#include "CustomMessageBox.h"
+#include "ProgressDialog.h"
+#include "ScrollMessageBox.h"
+#include "ui_ReviewMessageBox.h"
+
+#include "FileSystem.h"
+#include "Json.h"
+
+#include "minecraft/MinecraftInstance.h"
+#include "minecraft/PackProfile.h"
+
+#include "modplatform/EnsureMetadataTask.h"
+#include "modplatform/flame/FlameCheckUpdate.h"
+#include "modplatform/modrinth/ModrinthCheckUpdate.h"
+
+#include <HoeDown.h>
+
+#include <QTextEdit>
+#include <QTreeWidgetItem>
+
+static ModPlatform::ProviderCapabilities ProviderCaps;
+
+static std::list<Version> mcVersions(BaseInstance* inst)
+{
+    return { static_cast<MinecraftInstance*>(inst)->getPackProfile()->getComponent("net.minecraft")->getVersion() };
+}
+
+static ModAPI::ModLoaderTypes mcLoaders(BaseInstance* inst)
+{
+    return { static_cast<MinecraftInstance*>(inst)->getPackProfile()->getModLoaders() };
+}
+
+ModUpdateDialog::ModUpdateDialog(QWidget* parent,
+                                 BaseInstance* instance,
+                                 const std::shared_ptr<ModFolderModel>& mods,
+                                 std::list<Mod>& search_for)
+    : ReviewMessageBox(parent, tr("Confirm mods to update"), "")
+    , m_parent(parent)
+    , m_mod_model(mods)
+    , m_candidates(search_for)
+    , m_instance(instance)
+{
+    ReviewMessageBox::setGeometry(0, 0, 800, 600);
+
+    ui->explainLabel->setText(tr("You're about to update the following mods:"));
+    ui->onlyCheckedLabel->setText(tr("Only mods with a check will be updated!"));
+
+    connect(&m_check_task, &Task::failed, this,
+            [&](QString reason) { CustomMessageBox::selectable(this, tr("Error"), reason, QMessageBox::Critical)->exec(); });
+
+    connect(&m_check_task, &Task::succeeded, this, [&]() {
+        QStringList warnings = m_check_task.warnings();
+        if (warnings.count()) {
+            CustomMessageBox::selectable(this, tr("Warnings"), warnings.join('\n'), QMessageBox::Warning)->exec();
+        }
+    });
+}
+
+void ModUpdateDialog::checkCandidates()
+{
+    // Ensure mods have valid metadata
+    auto went_well = ensureMetadata();
+    if (!went_well) {
+        m_aborted = true;
+        return;
+    }
+
+    // Report failed metadata generation
+    if (!m_failed_metadata.empty()) {
+        QString text;
+        for (const auto& mod : m_failed_metadata) {
+            text += tr("Mod name: %1<br>File name: %2<br><br>").arg(mod.name(), mod.fileinfo().fileName());
+        }
+
+        ScrollMessageBox message_dialog(m_parent, tr("Metadata generation failed"),
+                                                   tr("Could not generate metadata for the following mods:<br>"
+                                                      "Do you wish to proceed without those mods?"),
+                                                   text);
+        message_dialog.setModal(true);
+        if (message_dialog.exec() == QDialog::Rejected) {
+            m_aborted = true;
+            QMetaObject::invokeMethod(this, "reject", Qt::QueuedConnection);
+            return;
+        }
+    }
+
+    auto versions = mcVersions(m_instance);
+    auto loaders = mcLoaders(m_instance);
+
+    if (!m_modrinth_to_update.empty()) {
+        m_modrinth_check_task = new ModrinthCheckUpdate(m_modrinth_to_update, versions, loaders, m_mod_model);
+        connect(m_modrinth_check_task, &CheckUpdateTask::checkFailed, this,
+                [this](Mod mod, QString reason, QUrl recover_url) { m_failed_check_update.emplace_back(mod, reason, recover_url); });
+        m_check_task.addTask(m_modrinth_check_task);
+    }
+
+    if (!m_flame_to_update.empty()) {
+        m_flame_check_task = new FlameCheckUpdate(m_flame_to_update, versions, loaders, m_mod_model);
+        connect(m_flame_check_task, &CheckUpdateTask::checkFailed, this,
+                [this](Mod mod, QString reason, QUrl recover_url) { m_failed_check_update.emplace_back(mod, reason, recover_url); });
+        m_check_task.addTask(m_flame_check_task);
+    }
+
+    // Check for updates
+    ProgressDialog progress_dialog(m_parent);
+    progress_dialog.setSkipButton(true, tr("Abort"));
+    progress_dialog.setVisible(true);
+    progress_dialog.setWindowTitle(tr("Checking for updates..."));
+    auto ret = progress_dialog.execWithTask(&m_check_task);
+
+    // If the dialog was skipped / some download error happened
+    if (ret == QDialog::DialogCode::Rejected) {
+        m_aborted = true;
+        QMetaObject::invokeMethod(this, "reject", Qt::QueuedConnection);
+        return;
+    }
+
+    // Add found updates for Modrinth
+    if (m_modrinth_check_task) {
+        auto modrinth_updates = m_modrinth_check_task->getUpdatable();
+        for (auto& updatable : modrinth_updates) {
+            qDebug() << QString("Mod %1 has an update available!").arg(updatable.name);
+
+            appendMod(updatable);
+            m_tasks.insert(updatable.name, updatable.download);
+        }
+    }
+
+    // Add found updated for Flame
+    if (m_flame_check_task) {
+        auto flame_updates = m_flame_check_task->getUpdatable();
+        for (auto& updatable : flame_updates) {
+            qDebug() << QString("Mod %1 has an update available!").arg(updatable.name);
+
+            appendMod(updatable);
+            m_tasks.insert(updatable.name, updatable.download);
+        }
+    }
+
+    // Report failed update checking
+    if (!m_failed_check_update.empty()) {
+        QString text;
+        for (const auto& failed : m_failed_check_update) {
+            const auto& mod = std::get<0>(failed);
+            const auto& reason = std::get<1>(failed);
+            const auto& recover_url = std::get<2>(failed);
+
+            qDebug() << mod.name() << " failed to check for updates!";
+
+            text += tr("Mod name: %1").arg(mod.name()) + "<br>";
+            if (!reason.isEmpty())
+                text += tr("Reason: %1").arg(reason) + "<br>";
+            if (!recover_url.isEmpty())
+                text += tr("Possible solution: ") + tr("Getting the latest version manually:") + "<br>" +
+                        QString("<a href='%1'>").arg(recover_url.toString()) + recover_url.toString() + "</a><br>";
+            text += "<br>";
+        }
+
+        ScrollMessageBox message_dialog(m_parent, tr("Failed to check for updates"),
+                                                   tr("Could not check or get the following mods for updates:<br>"
+                                                      "Do you wish to proceed without those mods?"),
+                                                   text);
+        message_dialog.setModal(true);
+        if (message_dialog.exec() == QDialog::Rejected) {
+            m_aborted = true;
+            QMetaObject::invokeMethod(this, "reject", Qt::QueuedConnection);
+            return;
+        }
+    }
+
+    // If there's no mod to be updated
+    if (ui->modTreeWidget->topLevelItemCount() == 0)
+        m_no_updates = true;
+
+    if (m_aborted || m_no_updates)
+        QMetaObject::invokeMethod(this, "reject", Qt::QueuedConnection);
+}
+
+// Part 1: Ensure we have a valid metadata
+auto ModUpdateDialog::ensureMetadata() -> bool
+{
+    auto index_dir = indexDir();
+
+    auto* seq = new SequentialTask(m_parent, tr("Looking for metadata"));
+
+    bool confirm_rest = false;
+    bool try_others_rest = false;
+    bool skip_rest = false;
+    ModPlatform::Provider provider_rest = ModPlatform::Provider::MODRINTH;
+
+    for (auto& candidate : m_candidates) {
+        if (candidate.status() != ModStatus::NoMetadata) {
+            onMetadataEnsured(candidate);
+            continue;
+        }
+
+        if (skip_rest)
+            continue;
+
+        if (confirm_rest) {
+            auto* task = new EnsureMetadataTask(candidate, index_dir, try_others_rest, provider_rest);
+            connect(task, &EnsureMetadataTask::metadataReady, [this, &candidate] { onMetadataEnsured(candidate); });
+            connect(task, &EnsureMetadataTask::metadataFailed, [this, &candidate] { onMetadataFailed(candidate); });
+            seq->addTask(task);
+            continue;
+        }
+
+        ChooseProviderDialog chooser(this);
+        chooser.setDescription(tr("This mod (%1) does not have a metadata yet. We need to create one in order to keep relevant "
+                                  "information on how to update this "
+                                  "mod. To do this, please select a mod provider from which we can search for updates for %1.")
+                                   .arg(candidate.name()));
+        auto confirmed = chooser.exec() == QDialog::DialogCode::Accepted;
+
+        auto response = chooser.getResponse();
+
+        if (response.skip_all)
+            skip_rest = true;
+        if (response.confirm_all) {
+            confirm_rest = true;
+            provider_rest = response.chosen;
+            try_others_rest = response.try_others;
+        }
+
+        if (confirmed) {
+            auto* task = new EnsureMetadataTask(candidate, index_dir, response.try_others, response.chosen);
+            connect(task, &EnsureMetadataTask::metadataReady, [this, &candidate] { onMetadataEnsured(candidate); });
+            connect(task, &EnsureMetadataTask::metadataFailed, [this, &candidate] { onMetadataFailed(candidate); });
+            seq->addTask(task);
+        }
+    }
+
+    ProgressDialog checking_dialog(m_parent);
+    checking_dialog.setSkipButton(true, tr("Abort"));
+    checking_dialog.setWindowTitle(tr("Generating metadata..."));
+    auto ret_metadata = checking_dialog.execWithTask(seq);
+
+    return (ret_metadata != QDialog::DialogCode::Rejected);
+}
+
+void ModUpdateDialog::onMetadataEnsured(Mod& mod)
+{
+    // When the mod is a folder, for instance
+    if (!mod.metadata())
+        return;
+
+    switch (mod.metadata()->provider) {
+        case ModPlatform::Provider::MODRINTH:
+            m_modrinth_to_update.push_back(mod);
+            break;
+        case ModPlatform::Provider::FLAME:
+            m_flame_to_update.push_back(mod);
+            break;
+    }
+}
+
+void ModUpdateDialog::onMetadataFailed(Mod& mod)
+{
+    m_failed_metadata.push_back(mod);
+}
+
+void ModUpdateDialog::appendMod(CheckUpdateTask::UpdatableMod const& info)
+{
+    auto item_top = new QTreeWidgetItem(ui->modTreeWidget);
+    item_top->setCheckState(0, Qt::CheckState::Checked);
+    item_top->setText(0, info.name);
+    item_top->setExpanded(true);
+
+    auto provider_item = new QTreeWidgetItem(item_top);
+    provider_item->setText(0, tr("Provider: %1").arg(ProviderCaps.readableName(info.provider)));
+
+    auto old_version_item = new QTreeWidgetItem(item_top);
+    old_version_item->setText(0, tr("Old version: %1").arg(info.old_version.isEmpty() ? tr("Not installed") : info.old_version));
+
+    auto new_version_item = new QTreeWidgetItem(item_top);
+    new_version_item->setText(0, tr("New version: %1").arg(info.new_version));
+
+    auto changelog_item = new QTreeWidgetItem(item_top);
+    changelog_item->setText(0, tr("Changelog of the latest version"));
+
+    auto changelog = new QTreeWidgetItem(changelog_item);
+
+    auto changelog_area = new QTextEdit();
+    HoeDown h;
+    changelog_area->setText(h.process(info.changelog.toUtf8()));
+    changelog_area->setReadOnly(true);
+    if (info.changelog.size() < 250)  // heuristic
+        changelog_area->setSizeAdjustPolicy(QTextEdit::SizeAdjustPolicy::AdjustToContents);
+
+    ui->modTreeWidget->setItemWidget(changelog, 0, changelog_area);
+    changelog_item->insertChildren(0, { changelog });
+
+    item_top->insertChildren(0, { old_version_item });
+    item_top->insertChildren(1, { new_version_item });
+    item_top->insertChildren(2, { changelog_item });
+
+    ui->modTreeWidget->addTopLevelItem(item_top);
+}
+
+auto ModUpdateDialog::getTasks() -> const std::list<ModDownloadTask*>
+{
+    std::list<ModDownloadTask*> list;
+
+    auto* item = ui->modTreeWidget->topLevelItem(0);
+
+    for (int i = 0; item != nullptr; ++i) {
+        if (item->checkState(0) == Qt::CheckState::Checked) {
+            list.push_back(m_tasks.find(item->text(0)).value());
+        }
+
+        item = ui->modTreeWidget->topLevelItem(i);
+    }
+
+    return list;
+}
diff --git a/launcher/ui/dialogs/ModUpdateDialog.h b/launcher/ui/dialogs/ModUpdateDialog.h
new file mode 100644
index 00000000..30cd5cbd
--- /dev/null
+++ b/launcher/ui/dialogs/ModUpdateDialog.h
@@ -0,0 +1,61 @@
+#pragma once
+
+#include "BaseInstance.h"
+#include "ModDownloadTask.h"
+#include "ReviewMessageBox.h"
+
+#include "minecraft/mod/ModFolderModel.h"
+
+#include "modplatform/CheckUpdateTask.h"
+
+class Mod;
+class ModrinthCheckUpdate;
+class FlameCheckUpdate;
+
+class ModUpdateDialog final : public ReviewMessageBox {
+    Q_OBJECT
+   public:
+    explicit ModUpdateDialog(QWidget* parent,
+                             BaseInstance* instance,
+                             const std::shared_ptr<ModFolderModel>& mod_model,
+                             std::list<Mod>& search_for);
+
+    void checkCandidates();
+
+    void appendMod(const CheckUpdateTask::UpdatableMod& info);
+
+    const std::list<ModDownloadTask*> getTasks();
+    auto indexDir() const -> QDir { return m_mod_model->indexDir(); }
+
+    auto noUpdates() const -> bool { return m_no_updates; };
+    auto aborted() const -> bool { return m_aborted; };
+
+   private:
+    auto ensureMetadata() -> bool;
+
+   private slots:
+    void onMetadataEnsured(Mod&);
+    void onMetadataFailed(Mod&);
+
+   private:
+    QWidget* m_parent;
+
+    SequentialTask m_check_task;
+    ModrinthCheckUpdate* m_modrinth_check_task = nullptr;
+    FlameCheckUpdate* m_flame_check_task = nullptr;
+
+    const std::shared_ptr<ModFolderModel>& m_mod_model;
+
+    std::list<Mod>& m_candidates;
+    std::list<Mod> m_modrinth_to_update;
+    std::list<Mod> m_flame_to_update;
+
+    std::list<Mod> m_failed_metadata;
+    std::list<std::tuple<Mod, QString, QUrl>> m_failed_check_update;
+
+    QHash<QString, ModDownloadTask*> m_tasks;
+    BaseInstance* m_instance;
+
+    bool m_no_updates = false;
+    bool m_aborted = false;
+};
diff --git a/launcher/ui/dialogs/ScrollMessageBox.ui b/launcher/ui/dialogs/ScrollMessageBox.ui
index 299d2ecc..e684185f 100644
--- a/launcher/ui/dialogs/ScrollMessageBox.ui
+++ b/launcher/ui/dialogs/ScrollMessageBox.ui
@@ -6,7 +6,7 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>400</width>
+    <width>500</width>
     <height>455</height>
    </rect>
   </property>