This happened to me as well, it pretty much looks like you are out of luck unless someone responds to your email, which is highly unlikely. They only way I got my key back was because I found an old copy of it. Copying the key.dat file doesn't seem to work anymore either, so thats out of the question.
If you do find it, make sure you recopy it LOTS of places, never want to lose $20 worth of stuff.