Add update switch

install.ps1

@@ -1,3 +1,7 @@
+param (
+  [switch]$update
+)
+
 # Enable TLSv1.2 for compatibility with older clients
 [Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
 
@@ -24,7 +28,8 @@ REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Uninstall\dsr" /f /v Dis
 REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Uninstall\dsr" /f /v InstallLocation /t REG_SZ /d "$env:LOCALAPPDATA\DSR"
 
 # Ask user to add a shortcut to the desktop
-if ($Host.UI.PromptForChoice(
+if (-not $update) {
+  if ($Host.UI.PromptForChoice(
     "***********************",
     "Add a desktop shortcut?",
     @(
@@ -36,4 +41,5 @@ if ($Host.UI.PromptForChoice(
     $Shortcut = $WshShell.CreateShortcut("$Desktop\DSR.lnk")
     $Shortcut.TargetPath = "$env:LOCALAPPDATA\DSR\dsr.exe"
     $Shortcut.Save()
+  }
 }