handle installation scope for PowerShell modules

src/UniGetUI.Avalonia/ViewModels/DialogPages/InstallOptionsViewModel.cs

@@ -436,6 +436,12 @@ private void ApplyProfileEnableState()
         SkipHashEnabled = op is not OperationType.Uninstall && caps.CanSkipIntegrityChecks;
         ArchEnabled = op is not OperationType.Uninstall && caps.SupportsCustomArchitectures;
         VersionEnabled = op is OperationType.Install && (caps.SupportsCustomVersions || caps.SupportsPreRelease);
+        ScopeEnabled = caps.SupportsCustomScopes && op switch
+        {
+            OperationType.Update => caps.SupportsCustomScopesOnUpdate,
+            OperationType.Uninstall => caps.SupportsCustomScopesOnUninstall,
+            _ => true,
+        };
     }
 
     // ── Live command preview ──────────────────────────────────────────────────

src/UniGetUI.PackageEngine.Enums/ManagerCapabilities.cs

@@ -37,6 +37,10 @@ public struct ManagerCapabilities
         public bool SupportsCustomArchitectures = false;
         public string[] SupportedCustomArchitectures = [];
         public bool SupportsCustomScopes = false;
+        // Whether a custom scope can be applied to update/uninstall too, not just install
+        // (e.g. Windows PowerShell 5.x's Update-Module has no -Scope parameter)
+        public bool SupportsCustomScopesOnUpdate = true;
+        public bool SupportsCustomScopesOnUninstall = true;
         public bool SupportsPreRelease = false;
         public bool SupportsCustomLocations = false;
         public bool SupportsCustomSources = false;

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

@@ -36,16 +36,11 @@ OperationType operation
             // 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
-                    || (
-                        package.OverridenOptions.Scope is null
-                        && options.InstallationScope == PackageScope.Global
-                    )
-                )
-                    parameters.AddRange(["-Scope", "AllUsers"]);
-                else
-                    parameters.AddRange(["-Scope", "CurrentUser"]);
+                // The scope chosen in the options dialog wins; fall back to the auto-detected install scope
+                string scope = options.InstallationScope.Length > 0
+                    ? options.InstallationScope
+                    : package.OverridenOptions.Scope ?? "";
+                parameters.AddRange(["-Scope", scope == PackageScope.Global ? "AllUsers" : "CurrentUser"]);
             }
         }
 

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

@@ -25,6 +25,9 @@ public PowerShell()
                 SupportsCustomVersions = true,
                 CanDownloadInstaller = true,
                 SupportsCustomScopes = true,
+                // Update-Module/Uninstall-Module (PowerShellGet) take no -Scope; only Install-Module does
+                SupportsCustomScopesOnUpdate = false,
+                SupportsCustomScopesOnUninstall = false,
                 CanListDependencies = true,
                 SupportsCustomSources = true,
                 SupportsPreRelease = true,

src/UniGetUI.PackageEngine.Managers.PowerShell7/Helpers/PowerShell7PkgOperationHelper.cs

@@ -49,16 +49,11 @@ OperationType operation
             if (options.PreRelease)
                 parameters.Add("-Prerelease");
 
-            if (
-                package.OverridenOptions.Scope is PackageScope.Global
-                || (
-                    package.OverridenOptions.Scope is null
-                    && options.InstallationScope is PackageScope.Global
-                )
-            )
-                parameters.AddRange(["-Scope", "AllUsers"]);
-            else
-                parameters.AddRange(["-Scope", "CurrentUser"]);
+            // The scope chosen in the options dialog wins; fall back to the auto-detected install scope
+            string scope = options.InstallationScope.Length > 0
+                ? options.InstallationScope
+                : package.OverridenOptions.Scope ?? "";
+            parameters.AddRange(["-Scope", scope == PackageScope.Global ? "AllUsers" : "CurrentUser"]);
         }
 
         parameters.AddRange(

src/UniGetUI.PackageEngine.Managers.PowerShell7/PowerShell7.cs

@@ -23,6 +23,8 @@ public PowerShell7()
                 CanRunAsAdmin = true,
                 SupportsCustomVersions = true,
                 SupportsCustomScopes = true,
+                // Uninstall-PSResource is invoked without a scope, so the selector is a no-op there
+                SupportsCustomScopesOnUninstall = false,
                 SupportsCustomSources = true,
                 SupportsPreRelease = true,
                 CanDownloadInstaller = true,

src/UniGetUI.PackageEngine.Tests/PowerShell7ManagerTests.cs

@@ -1,6 +1,7 @@
 #if WINDOWS
 using UniGetUI.PackageEngine.Enums;
 using UniGetUI.PackageEngine.Managers.PowerShell7Manager;
+using UniGetUI.PackageEngine.Serializable;
 
 namespace UniGetUI.PackageEngine.Tests;
 
@@ -62,6 +63,53 @@ public void ParseInstalledPackages_SkipsBlankAndMalformedLines()
         Assert.Equal("Pester", package.Id);
     }
 
+    // Regression for https://github.com/Devolutions/UniGetUI/issues/5110:
+    // a scope explicitly chosen in the options dialog must override the auto-detected
+    // install scope, otherwise the command never changes for an installed module.
+    [Fact]
+    public void GetParameters_ExplicitScopeOverridesDetectedScope()
+    {
+        var manager = new PowerShell7();
+        var package = Assert.Single(PowerShell7.ParseInstalledPackages(
+            ["##SCOPE:AllUsers##", "Devolutions.PowerShell\t2025.1.0\tPSGallery"], manager));
+        Assert.Equal(PackageScope.Machine, package.OverridenOptions.Scope);
+
+        var options = new InstallOptions { InstallationScope = PackageScope.User };
+        var parameters = manager.OperationHelper.GetParameters(package, options, OperationType.Update);
+
+        Assert.Contains("CurrentUser", parameters);
+        Assert.DoesNotContain("AllUsers", parameters);
+    }
+
+    [Fact]
+    public void GetParameters_ExplicitGlobalOverridesDetectedUserScope()
+    {
+        var manager = new PowerShell7();
+        var package = Assert.Single(PowerShell7.ParseInstalledPackages(
+            ["##SCOPE:CurrentUser##", "Devolutions.PowerShell\t2025.1.0\tPSGallery"], manager));
+        Assert.Equal(PackageScope.User, package.OverridenOptions.Scope);
+
+        var options = new InstallOptions { InstallationScope = PackageScope.Machine };
+        var parameters = manager.OperationHelper.GetParameters(package, options, OperationType.Update);
+
+        Assert.Contains("AllUsers", parameters);
+        Assert.DoesNotContain("CurrentUser", parameters);
+    }
+
+    [Fact]
+    public void GetParameters_DefaultScopeFallsBackToDetectedScope()
+    {
+        var manager = new PowerShell7();
+        var package = Assert.Single(PowerShell7.ParseInstalledPackages(
+            ["##SCOPE:AllUsers##", "Devolutions.PowerShell\t2025.1.0\tPSGallery"], manager));
+
+        var options = new InstallOptions();
+        var parameters = manager.OperationHelper.GetParameters(package, options, OperationType.Update);
+
+        Assert.Contains("AllUsers", parameters);
+        Assert.DoesNotContain("CurrentUser", parameters);
+    }
+
     // Regression for https://github.com/Devolutions/UniGetUI/issues/4781:
     // the previous Format-Table-based pipeline truncated long names (e.g.
     // "Microsoft.Graph.Beta.DeviceManagement.Administration" → "Microsoft.Graph.Beta..")

src/UniGetUI.PackageEngine.Tests/PowerShellManagerTests.cs

@@ -1,5 +1,7 @@
 #if WINDOWS
+using UniGetUI.PackageEngine.Enums;
 using UniGetUI.PackageEngine.Managers.PowerShellManager;
+using UniGetUI.PackageEngine.Serializable;
 
 namespace UniGetUI.PackageEngine.Tests;
 
@@ -55,5 +57,51 @@ public void ParseInstalledPackages_SkipsMalformedLines()
 
         Assert.Equal("Pester", package.Id);
     }
+
+    private static UniGetUI.PackageEngine.Interfaces.IPackage BuildInstalledPackage(PowerShell manager)
+        => Assert.Single(PowerShell.ParseInstalledPackages(
+            [
+                "Version Name Repository Description",
+                "------- ---- ---------- -----------",
+                "1.0.0 Devolutions.PowerShell PSGallery x",
+            ],
+            manager));
+
+    [Fact]
+    public void GetParameters_InstallRespectsExplicitScope()
+    {
+        var manager = new PowerShell();
+        var package = BuildInstalledPackage(manager);
+
+        var options = new InstallOptions { InstallationScope = PackageScope.Machine };
+        var parameters = manager.OperationHelper.GetParameters(package, options, OperationType.Install);
+
+        Assert.Contains("-Scope", parameters);
+        Assert.Contains("AllUsers", parameters);
+    }
+
+    // Regression for https://github.com/Devolutions/UniGetUI/issues/5110:
+    // Update-Module (Windows PowerShell 5.x / PowerShellGet 1.0.0.1) has no -Scope parameter,
+    // so no scope must be emitted for an update regardless of the selected scope.
+    [Fact]
+    public void GetParameters_UpdateOmitsScope()
+    {
+        var manager = new PowerShell();
+        var package = BuildInstalledPackage(manager);
+
+        var options = new InstallOptions { InstallationScope = PackageScope.Machine };
+        var parameters = manager.OperationHelper.GetParameters(package, options, OperationType.Update);
+
+        Assert.DoesNotContain("-Scope", parameters);
+    }
+
+    [Fact]
+    public void Capabilities_ScopeAppliesToInstallOnly()
+    {
+        var manager = new PowerShell();
+        Assert.True(manager.Capabilities.SupportsCustomScopes);
+        Assert.False(manager.Capabilities.SupportsCustomScopesOnUpdate);
+        Assert.False(manager.Capabilities.SupportsCustomScopesOnUninstall);
+    }
 }
 #endif