Registration Number?key is lost after each and every single upgrade

This has happened since I've owned the product (not that long - 3 months), but whenever I upgrade to the latest GR, I lose all my registration info and that irritating "28 days left in your trial..." My point is after dropping my own personal coin on this application (which is a great freaking application), I do not want to see anything related to "buy me". Because I own it.

End of the world? No

Irritating as crap? Depends on if I'm already irritated. This in and of itself is relatively minor compared to being shot at.
Maybe it's an easy fix - check for code, call your registration api or whatever its call and pass in my existing registration code when i upgrade. I'm not a developer so that may not make any sense.

Thanks
Robert
GBoS