#Requires -Version 5.1
$ErrorActionPreference='SilentlyContinue'
# Register the inbox App Installer if present, else nothing to do (offline image w/o it).
Get-AppxPackage -AllUsers Microsoft.DesktopAppInstaller |
  ForEach-Object { Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml" }