Can't compress

I just downloaded DVDFab HD and tried to copy one of my movies but I don’t have the option to compress to a dvd5 only to dvd9 which is too large too fit on my disks. Does anyone have an explanation for this? is it because I only have the free version?

The free version of DvdFab is a ripper only. It does not compress. If you want compression, you will either have to buy a licence for one of the paid versions (DvdFab Platinum recommended) or else process the output of DvdFab HD Decrypter with another program (e.g. Dvd Shrink).