I would contact the Chinese developers of the software. Anytime I had a problem with my “purchased” version of DVDFab I contacted them and they fixed it for me. IF (not saying that you do) you have a pirated version of the software it is highly likely that the crack used to disable the authentication has been foiled by an upgraded version of the software. Try your “working version” on another computer and if it works great decide to use it AS IS without ever installing an upgrade!