Improve MSI update from v1

Sources/Winget-AutoUpdate/functions/Update-WAU.ps1

@@ -96,17 +96,26 @@ function Update-WAU {
                 }
             }
 
+            #Stop ServiceUI
+            $ServiceUI = Get-Process -ProcessName serviceui -ErrorAction SilentlyContinue
+            if ($ServiceUI) {
+                try {
+                    Write-ToLog "Stopping ServiceUI"
+                    $ServiceUI | Stop-Process
+                }
+                catch {
+                    Write-ToLog "Failed to stop ServiceUI"
+                }
+            }
+
+            #Uninstall WAU v1
+            Write-ToLog "Uninstalling WAU v1"
+            Start-Process powershell -ArgumentList "-WindowStyle Hidden -ExecutionPolicy Bypass -Command `"$WorkingDir\WAU-Uninstall.ps1`"" -Wait
+
             #Update WAU and run
             Write-ToLog "Updating WAU..." "Yellow"
             Start-Process msiexec.exe -ArgumentList "/i $MsiFile /qn /L*v ""$WorkingDir\logs\WAU-Installer.log"" RUN_WAU=YES"
 
-            #Send success Notif
-            Write-ToLog "WAU Update completed. Rerunning WAU..." "Green"
-            $Title = $NotifLocale.local.outputs.output[3].title -f "Winget-AutoUpdate"
-            $Message = $NotifLocale.local.outputs.output[3].message -f $WAUAvailableVersion
-            $MessageType = "success"
-            Start-NotifTask -Title $Title -Message $Message -MessageType $MessageType -Button1Action $OnClickAction -Button1Text $Button1Text
-
             Exit 0
         }