If that is V5 be aware that if requested the License Key
for V5 early, then you may have gotten a file which was
not properly coded. You may want to request the V5
License Key again from the DVDFAB support page
and see if that fixes it. You can also try a complete uninstall
of the program & it’s folders, reboot, reinstall & double click
the reg key. Copying and pasting the key does not always
work properly, but double clicking it, usually does.