update the script to check for admin, not enforce

Start-UpgradeToWindows11.ps1

@@ -1,10 +1,5 @@
-# Elevate to run as administrator if not already
-#If ( -not ([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator") )
-#{
-#    Write-Output "Not running as administrator, relaunching as administrator"
-#    Start-Process powershell.exe "-NoProfile -ExecutionPolicy Bypass -NoExit -File `"$PSCommandPath`"" -Verb RunAs ; Exit 0
-#}
-#Else { Write-Output "Running as administrator" }
+# Exit if not running as administrator
+If ( -not ([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator") ) { Write-Output "This script must be run as an administrator" ; Exit 1 }
 
 # Get the operating system CIM instance
 Try { $OS = Get-CimInstance -ClassName Win32_OperatingSystem -ErrorAction Stop }