You can try to log in your Mac as administrator, trash DVDFab and its related documents. Open Finder->Applications to find DVDFab.app and move it to Trash, then go to Finder->Documents, delete the whole "DVDFab" folder, reboot your Mac to delete some temporary files that may be left over.
Then reinstall DVDFab for Mac 9.2.1.8 to see the result.
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