I don't think anyone ever reads these forums anymore. I'm surprised you were still even able to purchase/download the product. In its day, it worked great!
Is your problem just with registration? Are you able to use it at all?
I have Pyro 2004. Whenever I go into it, it always asks me to register. It didn't used to do that! But if I hit 'Cancel' it will proceed. That's when I encounter other problems! Like I said, none of this used to happen. You may be luckier.