Howto upgrade from the Windows Legacy Service.

  Garry: "The Windows-Legacy-Service is gone!"
  MacREADY: "Is there any way we can fix it?"
  Garry: "It's Gone MacREADY ...."

See: C:\Program Files\Openvpn\auto-config\readme.txt

Disclaimer: This howto-by-wiscii may not be accurate.