I bought DVDFab Platinum 3 way back when. It upgraded me automatically to version 4, but now that 5's out I'm having trouble getting my registration key to work. Does anyone have an answer? FYI, I have Vista and I think that's having an impact.
download version 5 from here
install it and when on the opening screen, at the bottom click on get new key. or go here and request a v5 key.
you will have to submit using the same email which you had when you purchased v3. but be sure to select v5 from the drop menu.