diff --git a/PSLauncher-0.6.0.exe b/PSLauncher-0.6.0.exe
new file mode 100644
index 0000000..cbdd4b7
Binary files /dev/null and b/PSLauncher-0.6.0.exe differ
diff --git a/installer/PSLauncher.iss b/installer/PSLauncher.iss
index c537ceb..5c6cb28 100644
--- a/installer/PSLauncher.iss
+++ b/installer/PSLauncher.iss
@@ -28,7 +28,9 @@ AppPublisher={#MyAppPublisher}
 AppPublisherURL={#MyAppURL}
 AppSupportURL={#MyAppURL}
 AppUpdatesURL={#MyAppURL}
-DefaultDirName={autopf}\{#MyAppPublisher}\{#MyAppShortName}
+; Installation user-mode (pas d'admin requis) : le launcher pourra se mettre à jour
+; tout seul via PSLauncher.Updater.exe sans déclencher de UAC.
+DefaultDirName={localappdata}\Programs\{#MyAppPublisher}\{#MyAppShortName}
 DefaultGroupName={#MyAppName}
 DisableProgramGroupPage=yes
 OutputDir=output
@@ -37,8 +39,9 @@ SetupIconFile=
 Compression=lzma2/ultra
 SolidCompression=yes
 WizardStyle=modern
-PrivilegesRequired=admin
+PrivilegesRequired=lowest
 PrivilegesRequiredOverridesAllowed=dialog
+UsedUserAreasWarning=no
 ArchitecturesAllowed=x64
 ArchitecturesInstallIn64BitMode=x64
 UninstallDisplayName={#MyAppName}
diff --git a/installer/output/PSLauncher-Setup-0.5.0.exe b/installer/output/PSLauncher-Setup-0.5.0.exe
new file mode 100644
index 0000000..a6ab447
Binary files /dev/null and b/installer/output/PSLauncher-Setup-0.5.0.exe differ
diff --git a/src/PSLauncher.Core/Updates/LauncherSelfUpdater.cs b/src/PSLauncher.Core/Updates/LauncherSelfUpdater.cs
index 81b9beb..51dd13c 100644
--- a/src/PSLauncher.Core/Updates/LauncherSelfUpdater.cs
+++ b/src/PSLauncher.Core/Updates/LauncherSelfUpdater.cs
@@ -84,23 +84,45 @@ public sealed class LauncherSelfUpdater : ILauncherSelfUpdater
             File.Move(downloadedPath, newPath);
         }
 
-        // 5. Lance l'updater détaché
+        // 5. Lance l'updater détaché. Si le target est dans un dossier protégé
+        // (Program Files, etc.), on ne pourra pas le remplacer sans admin :
+        // on demande l'élévation via ShellExecute + Verb=runas (UAC popup).
         var pid = Environment.ProcessId;
+        var needsElevation = !CanWriteTo(targetExe);
+
         var psi = new ProcessStartInfo
         {
             FileName = updaterPath,
-            UseShellExecute = false,
-            CreateNoWindow = true,
+            UseShellExecute = needsElevation,           // requis pour Verb=runas
+            CreateNoWindow = !needsElevation,
+            Verb = needsElevation ? "runas" : "",
+            Arguments = string.Join(' ', new[]
+            {
+                $"--target=\"{targetExe}\"",
+                $"--source=\"{newPath}\"",
+                $"--pid={pid}",
+                "--launch",
+            }),
         };
-        psi.ArgumentList.Add($"--target={targetExe}");
-        psi.ArgumentList.Add($"--source={newPath}");
-        psi.ArgumentList.Add($"--pid={pid}");
-        psi.ArgumentList.Add("--launch");
 
-        _logger.LogInformation("Spawning updater {Updater} (target={Target}, source={Source}, pid={Pid})",
-            updaterPath, targetExe, newPath, pid);
+        _logger.LogInformation("Spawning updater {Updater} (target={Target}, source={Source}, pid={Pid}, elevate={Elevate})",
+            updaterPath, targetExe, newPath, pid, needsElevation);
         SysProcess.Start(psi);
 
         return true; // l'appelant doit Application.Current.Shutdown() après
     }
+
+    /// <summary>Test rapide : peut-on écrire à côté du fichier cible (= dans son dossier) ?</summary>
+    private static bool CanWriteTo(string filePath)
+    {
+        try
+        {
+            var dir = Path.GetDirectoryName(filePath)!;
+            var probe = Path.Combine(dir, ".pslauncher-write-test-" + Guid.NewGuid().ToString("N").Substring(0, 8));
+            File.WriteAllText(probe, "");
+            File.Delete(probe);
+            return true;
+        }
+        catch { return false; }
+    }
 }
diff --git a/src/PSLauncher.Updater/Program.cs b/src/PSLauncher.Updater/Program.cs
index bcb75ae..d285f99 100644
--- a/src/PSLauncher.Updater/Program.cs
+++ b/src/PSLauncher.Updater/Program.cs
@@ -82,16 +82,21 @@ internal static class Program
                 return 4;
             }
 
-            // 5. Relance
+            // 5. Relance.
+            //    Si on a été lancé en admin (Verb=runas via UAC), un Process.Start direct
+            //    propagerait l'élévation au launcher et donc à tous ses sous-processus
+            //    (PROSERVE_UE_5_5.exe), ce qu'on ne veut pas. On passe par explorer.exe
+            //    qui est non-élévé : il ouvre l'exe dans la session utilisateur normale.
             if (opts.Launch)
             {
                 try
                 {
                     Process.Start(new ProcessStartInfo
                     {
-                        FileName = opts.Target,
-                        UseShellExecute = true,
-                        WorkingDirectory = Path.GetDirectoryName(opts.Target)!,
+                        FileName = "explorer.exe",
+                        Arguments = "\"" + opts.Target + "\"",
+                        UseShellExecute = false,
+                        CreateNoWindow = true,
                     });
                 }
                 catch (Exception ex)