Warn about in-place downgrades

Bloxstrap/App.xaml.cs

@@ -220,8 +220,10 @@ namespace Bloxstrap
 
                 Locale.Set(Settings.Prop.Locale);
 
+#if !DEBUG
                 if (!LaunchSettings.UninstallFlag.Active)
                     Installer.HandleUpgrade();
+#endif
 
                 LaunchHandler.ProcessLaunchArgs();
             }

Bloxstrap/Installer.cs

@@ -340,6 +340,18 @@ namespace Bloxstrap
             if (MD5Hash.FromFile(Paths.Process) == MD5Hash.FromFile(Paths.Application))
                 return;
 
+            if (currentVer is not null && existingVer is not null && Utilities.CompareVersions(currentVer, existingVer) == VersionComparison.LessThan)
+            {
+                var result = Frontend.ShowMessageBox(
+                    Strings.InstallChecker_VersionLessThanInstalled,
+                    MessageBoxImage.Question,
+                    MessageBoxButton.YesNo
+                );
+
+                if (result != MessageBoxResult.Yes)
+                    return;
+            }
+
             // silently upgrade version if the command line flag is set or if we're launching from an auto update
             if (!App.LaunchSettings.UpgradeFlag.Active && !isAutoUpgrade)
             {
@@ -466,6 +478,9 @@ namespace Bloxstrap
                 App.FastFlags.Save();
             }
 
+            if (currentVer is null)
+                return;
+
             if (isAutoUpgrade)
             {
                 Utilities.ShellExecute($"https://github.com/{App.ProjectRepository}/wiki/Release-notes-for-Bloxstrap-v{currentVer}");

Bloxstrap/Resources/Strings.Designer.cs

@@ -1276,6 +1276,17 @@ namespace Bloxstrap.Resources {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to The version of Bloxstrap you&apos;ve launched is older than the version you currently have installed.
+        ///Issues may occur and your settings may be altered. A reinstall is recommended.
+        ///Are you sure you want to continue?.
+        /// </summary>
+        public static string InstallChecker_VersionLessThanInstalled {
+            get {
+                return ResourceManager.GetString("InstallChecker.VersionLessThanInstalled", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Will drop you into the desktop app once everything&apos;s done.
         /// </summary>

Bloxstrap/Resources/Strings.resx

@@ -1142,4 +1142,9 @@ If not, then please report this exception to the maintainers of this fork. Do NO
   <data name="Menu.UnsavedChanges" xml:space="preserve">
     <value>You have unsaved changes. Are you sure you want to close without saving?</value>
   </data>
+  <data name="InstallChecker.VersionLessThanInstalled" xml:space="preserve">
+    <value>The version of Bloxstrap you've launched is older than the version you currently have installed.
+Issues may occur and your settings may be altered. A reinstall is recommended.
+Are you sure you want to continue?</value>
+  </data>
 </root>