I'm sorry the update process didn't go smoothly for you but I have to admit that I'm hurt you're calling us fraudsters and a rip off. If you would simply send us an email to tell us about your new email address, we're happy to update that in our system and you'll be set to receive the update coupon.
The email address is what the system uses to check whether you're eligible for the update discount or not so if you change the email address during checkout, the system cannot match you to the previous order anymore and thus invalidates the coupon.
Of course updates are not mandatory. If you'd rather stick with version 4, you can download that here: DVDpedia 4.6.8.
Make sure after you downgrade to version 4.6.8 you delete the data file for version 5 (Database.dvdpd) so that if you ever do decide to update, the program will be forced to do this from your 4.6.8 file. You will find the file in the DVDpedia data folder, located in your Home folder under ~/Library/Application Support/DVDpedia
If you're on Lion, it hides the Library folder by default so to go to your DVDpedia data folder you have to use the Finder's 'Go' menu, select 'Go to Folder' and copy paste ~/Library/Application Support/DVDpedia into the window that appears.