I own PQ DVD and recently purchased a new laptop. I'm trying to transfer the license to my new device but it appears the website to register the software is no longer active. If this is the case, how do I register my the application?
Maybe you need to pay for the application.
Just like you've said, the official website doesn't work anymore which means registration is not possible anymore. In this case, I recommend dumping this software in order to find something else that's supported. You can browse the database of Software Informer to download other applications from this category.
You must download a trial version. When I use macgo blu-ray player the first time, I met this situation too. After I ordered it, it runs pretty smooth.