Fix PowerShell updates failing (#4865)

src/UniGetUI.PackageEngine.Managers.PowerShell/Helpers/PowerShellPkgOperationHelper.cs

@@ -33,7 +33,8 @@ OperationType operation
             if (options.PreRelease)
                 parameters.Add("-AllowPrerelease");
 
-            if (!package.OverridenOptions.PowerShell_DoNotSetScopeParameter)
+            // Update-Module (PowerShellGet) has no -Scope parameter; only Install-Module accepts it
+            if (operation is OperationType.Install && !package.OverridenOptions.PowerShell_DoNotSetScopeParameter)
             {
                 if (
                     package.OverridenOptions.Scope == PackageScope.Global
@@ -66,6 +67,10 @@ package.OverridenOptions.Scope is null
             }
         );
 
+        // Windows PowerShell 5.x defaults to TLS 1.0/1.1, which the PowerShell Gallery rejects; force TLS 1.2 so gallery operations can connect under -NoProfile
+        if (operation is not OperationType.Uninstall)
+            parameters.Insert(0, "[Net.ServicePointManager]::SecurityProtocol=[Net.SecurityProtocolType]::Tls12;");
+
         return parameters;
     }
 

src/UniGetUI.PackageEngine.Operations/AbstractProcessOperation.cs

@@ -103,6 +103,18 @@ protected override async Task<OperationVeredict> PerformOperation()
         Line($" - Arguments: \"{process.StartInfo.Arguments.Trim()}\"", LineType.VerboseDetails);
         Line($"Start Time: \"{DateTime.Now}\"", LineType.VerboseDetails);
 
+        // An empty FileName means elevation was required but no elevator (UniGetUI Elevator/GSudo) is available
+        if (string.IsNullOrWhiteSpace(process.StartInfo.FileName))
+        {
+            Line(
+                CoreTools.Translate(
+                    "This operation requires administrator privileges, but the elevation tool could not be found. The operation cannot continue."
+                ),
+                LineType.Error
+            );
+            return OperationVeredict.Failure;
+        }
+
         if (_requiresUACCache)
         {
             _requiresUACCache = false;