(First off, if it asks for a key I assume you have one of the first versions.)
If you still have your installer, you're lucky: You can upgrade from an 1.0.x installation by using
a little tool I made, and then further as described in
this topic.
It does not need the key for the installation, only for running the game. But if you follow this, you do
not need a key after updating, it won't ask anymore and runs well without one.
If you don't have the installer anymore, email zaphire@gmail.com (= Alec) with your infos. If you don't get a response within a few days, post here again and we'll see what to do.
Also, if you get an answer privately, it would be nice to post a quick note that you got helped, because about once a month someone with the same problem appears here and hardly anyone ever says anything anymore after their initial post.

(Btw, I heard that admin@bit-blot.com is flooded with spam and no-one actually checks it anymore.)