Have you "authorized" your installed DVDFab product? In DVDFab you should see a dropdown in the upper right corner of the opening screen - click it and choose "authorize".
In DVDFab. I am assuming you bought the software, right? I believe you can authorize on 2 computers and maybe more if you bought the extra authorizations.
The "authorize" should ask you for the email you used to purchase.
See attached image.
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