I too have been looking for Avalon 2.1. It's unfortunate that you haven't gotten a reply to your request. I'm sure it's out there somewhere. I did several internet searches but failed to find it. (or even any reference to it).
I purchased Avalon from a German guy a month ago. I thought it was vs. 2.0. Turns out it was vs. 1.0 and it fails to boot on my STE. At least I have the dongle, right? Perhaps I can use the same dongle with later versions of the software?