diff --git a/Setup/MainWindow.xaml.cs b/Setup/MainWindow.xaml.cs
deleted file mode 100644
index d6cd7ee..0000000
--- a/Setup/MainWindow.xaml.cs
+++ /dev/null
@@ -1,279 +0,0 @@
-using System.Diagnostics;
-using System.IO;
-using System.Windows;
-using System.Windows.Controls;
-using System.Windows.Media;
-using System.Windows.Media.Animation;
-
-namespace DeskCoreSetup;
-
-public partial class MainWindow : Window
-{
-    private readonly bool _uninstall;
-    private int _page;
-    private bool _busy;
-    private bool _done;
-    private string? _installedExe;
-
-    public MainWindow(bool uninstall)
-    {
-        InitializeComponent();
-        _uninstall = uninstall;
-        VersionText.Text = $"Version {Installer.Version}";
-        LicenseText.Text = Installer.LicenseText;
-
-        DirBox.Text = Installer.InstalledDir ?? Installer.DefaultDir;
-        DesktopLinkBox.IsChecked = Installer.InstalledDir is null || Installer.DesktopLinkExists;
-        AutostartBox.IsChecked = Installer.AutostartEnabled;
-
-        if (!Runtime.IsInstalled)
-        {
-            RuntimeHint.Visibility = Visibility.Visible;
-            RuntimeBox.Visibility = Visibility.Visible;
-            RuntimeHintText.Text = Runtime.Is64BitWindows
-                ? "DeskCore benötigt die kostenlose „Microsoft .NET 9 Desktop Runtime“. Sie fehlt auf diesem PC und wird bei der " +
-                  "Installation automatisch von Microsoft geladen (ca. 55 MB). Windows fragt dabei einmal nach Administratorrechten."
-                : "DeskCore benötigt ein 64-Bit-Windows (Windows 10 oder 11) und kann auf diesem PC leider nicht installiert werden.";
-        }
-
-        if (Installer.InstalledDir is null && Installer.LegacyInstallDir is not null)
-        {
-            UpdateHint.Visibility = Visibility.Visible;
-            UpdateHintText.Text = "Die bisherige Version „DeskHub“ wird durch DeskCore ersetzt. Deine Kategorien und Einstellungen werden übernommen.";
-        }
-        else if (Installer.InstalledDir is not null)
-        {
-            UpdateHint.Visibility = Visibility.Visible;
-            UpdateHintText.Text = Installer.InstalledVersion == Installer.Version
-                ? $"DeskCore {Installer.Version} ist bereits installiert und wird neu installiert. Deine Kategorien und Einstellungen bleiben erhalten."
-                : $"Die vorhandene Installation (Version {Installer.InstalledVersion}) wird durch Version {Installer.Version} ersetzt. Deine Kategorien und Einstellungen bleiben erhalten.";
-        }
-
-        if (_uninstall)
-        {
-            Title = WindowTitle.Text = "DeskCore deinstallieren";
-            Steps.Visibility = Visibility.Collapsed;
-            ShowOnly(PageUninstall);
-            NextButton.Content = "Deinstallieren";
-            BackButton.Visibility = Visibility.Collapsed;
-            LoadDataInfo();
-        }
-        else ShowPage(0);
-    }
-
-    // ---------- Seiten ----------
-
-    private void ShowOnly(UIElement page)
-    {
-        foreach (var p in new UIElement[] { PageWelcome, PageLicense, PageOptions, PageProgress, PageUninstall })
-            p.Visibility = p == page ? Visibility.Visible : Visibility.Collapsed;
-    }
-
-    private void ShowPage(int page)
-    {
-        _page = page;
-        ShowOnly(page switch { 0 => PageWelcome, 1 => PageLicense, 2 => PageOptions, _ => PageProgress });
-
-        var steps = new[] { Step0, Step1, Step2, Step3 };
-        for (int i = 0; i < steps.Length; i++)
-        {
-            var label = ((string)steps[i].Tag ?? (string)(steps[i].Tag = steps[i].Text));
-            steps[i].Text = i < page || (_done && i == page) ? $"✓  {label}" : label;
-            steps[i].FontWeight = i == page ? FontWeights.SemiBold : FontWeights.Normal;
-            steps[i].Foreground = (Brush)FindResource(i == page ? "TextBrush" : i < page ? "TextSecondaryBrush" : "TextTertiaryBrush");
-        }
-
-        BackButton.Visibility = page is 1 or 2 ? Visibility.Visible : Visibility.Hidden;
-        NextButton.Content = page switch { 2 => "Installieren", 3 => "Fertigstellen", _ => "Weiter" };
-        NextButton.IsEnabled = page != 1 || AcceptLicense.IsChecked == true;
-    }
-
-    private void AcceptLicense_Click(object sender, RoutedEventArgs e) => NextButton.IsEnabled = AcceptLicense.IsChecked == true;
-
-    private void Back_Click(object sender, RoutedEventArgs e)
-    {
-        if (!_busy && _page > 0) ShowPage(_page - 1);
-    }
-
-    private async void Next_Click(object sender, RoutedEventArgs e)
-    {
-        if (_busy) return;
-
-        if (_uninstall)
-        {
-            if (_done) { Close(); return; }
-            await RunUninstall();
-            return;
-        }
-
-        switch (_page)
-        {
-            case 0: ShowPage(1); break;
-            case 1 when AcceptLicense.IsChecked == true: ShowPage(2); break;
-            case 2:
-                var dir = DirBox.Text.Trim();
-                if (!IsFullPath(dir) || dir.IndexOfAny(Path.GetInvalidPathChars()) >= 0)
-                {
-                    MessageBox.Show(this, "Bitte einen gültigen Ordner angeben, z. B. C:\\Programme\\DeskCore.", "DeskCore Setup");
-                    return;
-                }
-                await RunInstall(dir);
-                break;
-            case 3:
-                if (LaunchBox.IsChecked == true && _installedExe is not null)
-                    Process.Start(new ProcessStartInfo(_installedExe) { UseShellExecute = true });
-                Close();
-                break;
-        }
-    }
-
-    private void ChangeDir_Click(object sender, RoutedEventArgs e)
-    {
-        using var dlg = new System.Windows.Forms.FolderBrowserDialog
-        {
-            Description = "Installationsordner wählen",
-            SelectedPath = Directory.Exists(DirBox.Text) ? DirBox.Text : Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
-            ShowNewFolderButton = true,
-        };
-        if (dlg.ShowDialog() != System.Windows.Forms.DialogResult.OK) return;
-        var chosen = dlg.SelectedPath;
-        // wie bei üblichen Installern: Unterordner "DeskCore" anhängen
-        DirBox.Text = Path.GetFileName(chosen.TrimEnd('\\')).Equals("DeskCore", StringComparison.OrdinalIgnoreCase)
-            ? chosen : Path.Combine(chosen, "DeskCore");
-    }
-
-    // ---------- Installation ----------
-
-    private async Task RunInstall(string dir)
-    {
-        _busy = true;
-        ShowPage(3);
-        SetButtons(false);
-        var progress = new Progress<(double Value, string Text)>(p => SetProgress(p.Value, p.Text));
-        bool desktop = DesktopLinkBox.IsChecked == true, autostart = AutostartBox.IsChecked == true;
-        bool runtime = RuntimeBox.Visibility == Visibility.Visible && RuntimeBox.IsChecked == true;
-        try
-        {
-            await Task.Run(() => Installer.Install(dir, desktop, autostart, progress, runtime));
-            _installedExe = Path.Combine(dir, Installer.ExeName);
-            _done = true;
-            ProgressTitle.Text = "Installation abgeschlossen";
-            ProgressText.Text = $"DeskCore wurde in {dir} installiert. Du findest es im Startmenü" + (desktop ? " und auf dem Desktop." : ".");
-            DoneText.Text = "Alles bereit!";
-            DonePanel.Visibility = Visibility.Visible;
-            if (!Runtime.IsInstalled)
-            {
-                // Laufzeit fehlt weiterhin (abgewählt) → Hinweis statt Startversuch
-                DoneText.Text = "DeskCore ist installiert";
-                RuntimeMissing.Visibility = Visibility.Visible;
-                LaunchBox.IsChecked = false;
-                LaunchBox.IsEnabled = false;
-            }
-            ShowPage(3);
-        }
-        catch (Exception ex)
-        {
-            ProgressTitle.Text = "Installation fehlgeschlagen";
-            ProgressText.Text = ex.Message;
-            ProgressText.Foreground = (Brush)FindResource("DangerBrush");
-            NextButton.Content = "Schließen";
-            _installedExe = null;
-        }
-        _busy = false;
-        NextButton.IsEnabled = true;
-        CloseButton.IsEnabled = true;
-        BackButton.Visibility = Visibility.Hidden;
-        CancelButton.Visibility = Visibility.Collapsed;
-    }
-
-    // ---------- Deinstallation ----------
-
-    private async void LoadDataInfo()
-    {
-        var root = Installer.DataDirs[0];
-        if (!Directory.Exists(root))
-        {
-            DataInfo.Text = "Es wurden keine Kategorien gefunden.";
-            return;
-        }
-        DataInfo.Text = $"Sie liegen in {root}. Größe wird berechnet …";
-        var size = await Task.Run(Installer.DataSize);
-        DataInfo.Text = $"Sie liegen in {root} ({Installer.FormatSize(size)}) und bleiben dort, falls du DeskCore später wieder installierst.";
-    }
-
-    private void RemoveDataBox_Click(object sender, RoutedEventArgs e) =>
-        RemoveDataWarning.Visibility = RemoveDataBox.IsChecked == true ? Visibility.Visible : Visibility.Collapsed;
-
-    private async Task RunUninstall()
-    {
-        _busy = true;
-        bool removeData = RemoveDataBox.IsChecked == true;
-        ShowOnly(PageProgress);
-        ProgressTitle.Text = "DeskCore wird entfernt …";
-        LaunchBox.Visibility = Visibility.Collapsed;
-        SetButtons(false);
-        var progress = new Progress<(double Value, string Text)>(p => SetProgress(p.Value, p.Text));
-        try
-        {
-            await Task.Run(() => Installer.Uninstall(removeData, progress));
-            ProgressTitle.Text = "Deinstallation abgeschlossen";
-            ProgressText.Text = removeData
-                ? "DeskCore, deine Kategorien und Einstellungen wurden entfernt (die Daten liegen im Papierkorb)."
-                : "DeskCore wurde entfernt. Deine Kategorien liegen weiterhin in " + Installer.DataDirs[0] + ".";
-            DoneText.Text = "Fertig";
-            DonePanel.Visibility = Visibility.Visible;
-        }
-        catch (Exception ex)
-        {
-            ProgressTitle.Text = "Deinstallation fehlgeschlagen";
-            ProgressText.Text = ex.Message;
-        }
-        _done = true;
-        _busy = false;
-        CloseButton.IsEnabled = true;
-        NextButton.Content = "Schließen";
-        NextButton.IsEnabled = true;
-        CancelButton.Visibility = Visibility.Collapsed;
-    }
-
-    // ---------- Helfer ----------
-
-    private void SetButtons(bool enabled)
-    {
-        NextButton.IsEnabled = enabled;
-        BackButton.IsEnabled = enabled;
-        CancelButton.IsEnabled = enabled;
-        CloseButton.IsEnabled = enabled;
-    }
-
-    private void SetProgress(double value, string text)
-    {
-        if (!_done) ProgressText.Text = text;
-        var target = Math.Max(0, ProgressTrack.ActualWidth * value);
-        ProgressFill.BeginAnimation(WidthProperty,
-            new DoubleAnimation(target, TimeSpan.FromMilliseconds(250)) { EasingFunction = new CubicEase() });
-    }
-
-    private static bool IsFullPath(string p) =>
-        p.Length >= 3 && char.IsLetter(p[0]) && p[1] == ':' && (p[2] == '\\' || p[2] == '/');
-
-    private void OpenRuntimePage_Click(object sender, RoutedEventArgs e) =>
-        Process.Start(new ProcessStartInfo(Runtime.DownloadPage) { UseShellExecute = true });
-
-    private void Minimize_Click(object sender, RoutedEventArgs e) => WindowState = WindowState.Minimized;
-
-    private void Cancel_Click(object sender, RoutedEventArgs e)
-    {
-        if (_busy) return;
-        if (!_done && !_uninstall && _page > 0 &&
-            MessageBox.Show(this, "Installation wirklich abbrechen?", "DeskCore Setup", MessageBoxButton.YesNo, MessageBoxImage.Question) != MessageBoxResult.Yes)
-            return;
-        Close();
-    }
-
-    protected override void OnClosing(System.ComponentModel.CancelEventArgs e)
-    {
-        if (_busy) e.Cancel = true; // während der Installation nicht schließen
-        base.OnClosing(e);
-    }
-}