Registration would be possible if the setup package was still available for downloading. I've checked all the websites (including the official one), but there is no link available. The official domain expired which means it displays a generic page instead. Unfortunately, it's impossible to use the application if you lack the main installation package that represents the actual program.
I recommend searching for other applications from the same category through the following link: http://software.informer.com/search/DVD+to+iPod
