Release v2.6.2 — Install/Reinstall Python button + macOS initial release

- Button now relabels itself: 'Download & Install Python' when Python is absent,
  'Reinstall Python' when Python is already detected
- Version bumped to 2.6.2 across all version strings and footer
- Revision history and User Guide updated accordingly

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: ArtTrail

App.axaml.cs

@@ -21,7 +21,7 @@ public override void OnFrameworkInitializationCompleted()
     {
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
-            SessionLogService.Initialize("v2.6.1");
+            SessionLogService.Initialize("v2.6.2");
 
             // Avoid duplicate validations from both Avalonia and the CommunityToolkit.
             // More info: https://docs.avaloniaui.net/docs/guides/development-guides/data-validation#manage-validationplugins

ViewModels/ExoticSetupViewModel.cs

@@ -27,6 +27,7 @@ public partial class ExoticSetupViewModel : ViewModelBase
     // ── Button enable flags ────────────────────────────────────────────────────
     [ObservableProperty] private bool   _canCheck             = true;
     [ObservableProperty] private bool   _canGetPython         = false;
+    [ObservableProperty] private string _getPythonLabel       = "Download & Install Python";
     [ObservableProperty] private bool   _canInstallExotic     = false;
     [ObservableProperty] private bool   _canUninstallExotic   = false;
     [ObservableProperty] private bool   _canInstallBranch     = false;
@@ -72,6 +73,7 @@ private async Task CheckSystem()
                 ExoticStatusIcon = "✗";
                 ExoticStatus     = "Cannot check — Python required";
                 HeadlineText     = "Python is not installed.  Download and install it below, then install EXOTIC.";
+                GetPythonLabel   = "Download & Install Python";
                 CanGetPython     = true;
             }
             else
@@ -87,7 +89,8 @@ private async Task CheckSystem()
                     Log("  Click  Get Python  to download and install a fresh copy.");
                     ExoticStatusIcon = "✗";
                     ExoticStatus     = "Cannot check — Python is broken";
-                    HeadlineText     = "Python installation is corrupt.  Click  Get Python  to reinstall.";
+                    HeadlineText     = "Python installation is corrupt.  Click  Reinstall Python  to reinstall.";
+                    GetPythonLabel   = "Reinstall Python";
                     CanGetPython     = true;
                     return;
                 }
@@ -135,6 +138,8 @@ private async Task CheckSystem()
                     HeadlineText     = "Python is ready.  Click  Install EXOTIC  to continue.";
                     CanInstallExotic = true;
                 }
+                GetPythonLabel = "Reinstall Python";
+                CanGetPython   = true;
             }
         }
         catch (OperationCanceledException) { HeadlineText = "Cancelled."; }

ViewModels/MainWindowViewModel.cs

@@ -19,8 +19,8 @@ namespace TransitLab.ViewModels;
 
 public partial class MainWindowViewModel : ViewModelBase
 {
-    public string Version { get; } = "2.6.1";
-    public string Title   { get; } = "TransitLab  v2.6.1";
+    public string Version { get; } = "2.6.2";
+    public string Title   { get; } = "TransitLab  v2.6.2";
 
     public ExoticSetupViewModel     ExoticSetup     { get; } = new();
     public MObsViewModel            MObs            { get; } = new();

Views/AboutView.axaml

@@ -10,7 +10,7 @@
                        Text="TransitLab"
                        HorizontalAlignment="Center"/>
             <TextBlock Classes="hint"
-                       Text="Version 2.6.1"
+                       Text="Version 2.6.2"
                        HorizontalAlignment="Center"
                        Margin="0,4,0,0"/>
 

Views/MainWindow.axaml

@@ -92,7 +92,7 @@
         <!-- ── Bottom attribution bar ───────────────────────────────────── -->
         <Border DockPanel.Dock="Bottom" Padding="0,2,10,4">
             <TextBlock Classes="hint"
-                       Text="© Art Trail 2026  ·  TransitLab v2.6.1  ·  Powered by EXOTIC (Zellem, Pearson, Blaser et al. 2020, PASP 132)"
+                       Text="© Art Trail 2026  ·  TransitLab v2.6.2  ·  Powered by EXOTIC (Zellem, Pearson, Blaser et al. 2020, PASP 132)"
                        HorizontalAlignment="Right"/>
         </Border>
 

Views/RevisionHistoryView.axaml

@@ -7,6 +7,11 @@
 
         <StackPanel Spacing="6" Margin="32,20,32,24">
 
+            <!-- ── v2.6.2 ─────────────────────────────────────────────────────── -->
+            <TextBlock Classes="h2" Text="v2.6.2  —  2026-04-24" Margin="0,0,0,4"/>
+            <TextBlock TextWrapping="Wrap" Text="• Change: macOS initial release. No functional changes to the Windows version." Margin="0,0,0,4"/>
+            <TextBlock TextWrapping="Wrap" Text="• Improvement: The 'Download &amp; Install Python' button in Python &amp; EXOTIC Setup now relabels itself to 'Reinstall Python' when Python is already detected, making it clear the button can be used to repair a corrupt Python installation. The button is always enabled after Check System runs." Margin="0,0,0,12"/>
+
             <!-- ── v2.6.1 ─────────────────────────────────────────────────────── -->
             <TextBlock Classes="h2" Text="v2.6.1  —  2026-04-23" Margin="0,0,0,4"/>
             <TextBlock TextWrapping="Wrap" Text="• Internal: project renamed from ExoticLauncher to TransitLab throughout — namespaces, assembly name, and all source file references. No functional changes." Margin="0,0,0,4"/>

Views/Tabs/InstructionsView.axaml

@@ -257,8 +257,8 @@
             <TextBlock TextWrapping="Wrap" Text="• The Python &amp; EXOTIC Setup wizard walks you through installing, updating, or repairing Python and EXOTIC. Open it from Tools → Python &amp; EXOTIC Setup in the menu bar."/>
             <TextBlock TextWrapping="Wrap" Margin="20,4,0,0" FontWeight="SemiBold" Text="Check System"/>
             <TextBlock TextWrapping="Wrap" Margin="20,0,0,0" Text="Scans for an existing Python installation (≥ 3.8) and checks whether EXOTIC is installed. Shows the detected version and path for each. Run this first — it enables the other buttons based on what is found."/>
-            <TextBlock TextWrapping="Wrap" Margin="20,4,0,0" FontWeight="SemiBold" Text="Download &amp; Install Python"/>
-            <TextBlock TextWrapping="Wrap" Margin="20,0,0,0" Text="Downloads the Python 3.10.11 installer to your Temp folder (progress bar shown) and runs a silent installation. Enabled only when Python is not found."/>
+            <TextBlock TextWrapping="Wrap" Margin="20,4,0,0" FontWeight="SemiBold" Text="Download &amp; Install Python  /  Reinstall Python"/>
+            <TextBlock TextWrapping="Wrap" Margin="20,0,0,0" Text="Downloads the Python 3.10.11 installer to your Temp folder (progress bar shown) and runs a silent installation. This button is always enabled after Check System runs. Its label changes to 'Reinstall Python' when Python is already detected — use it to repair a corrupt or broken Python installation without affecting EXOTIC or other packages."/>
             <TextBlock TextWrapping="Wrap" Margin="20,4,0,0" FontWeight="SemiBold" Text="Install EXOTIC"/>
             <TextBlock TextWrapping="Wrap" Margin="20,0,0,0" Text="Upgrades pip, installs the required prerequisite packages (setuptools, wheel), then installs or upgrades EXOTIC via pip and streams the full output to the log box. Use this for first-time installs and routine upgrades. Enabled once Python is detected."/>
             <TextBlock TextWrapping="Wrap" Margin="20,4,0,0" FontWeight="SemiBold" Text="Uninstall EXOTIC"/>

Views/Tabs/SetupView.axaml

@@ -65,7 +65,7 @@
                     Command="{Binding CheckSystemCommand}"
                     IsEnabled="{Binding CanCheck}"/>
             <Button Classes="toolbar" Margin="0,0,8,4"
-                    Content="Download &amp; Install Python"
+                    Content="{Binding GetPythonLabel}"
                     Command="{Binding GetPythonCommand}"
                     IsEnabled="{Binding CanGetPython}"/>
             <Button Classes="toolbar" Margin="0,0,8,4"