Thank you for that info Josef. But, my situation is a little different. The old machine suffered a hard drive crash, so the DW system cannot run. All I have of the old machine is a backup of the database.
I installed only the front end services on the new machine which includes the auth server. I was planning on restoring the old database then running the installer for the back end and hoping that the new installer would have the same replace options as the version 6 one did. Not sure if it will work but I may give it a try.