Quicktime Pro Windows - Invalid Registration

Hi, I couldn't find anything about this, so I'm trying here. Mods, please move in the right area.

I bought a QuickTime Pro key for Windows back in 2004. It's no longer appearing in my order history and apparently Apple got rid of the purchased software page that had the key.

I do have my old email for it but when I enter that information it says "invalid registration key"

Anyone have any ideas what to do? I can't seem to contact Apple support about it either. There's never an option for this...

Thanks!