I just checked my Downloads folder and have the 64-bit version. I have to say I'm not particularly impressed with the performance - it's buggy and slow. I really want to make good use of the Clone Stamp Tool but am having a bitch of a time getting it to work consistently. It starts ok as a brush, then begins to reverse function or smear what I'm trying to erase into a new part of the area.
After further testing, which I swear I did the other day, the end result is match the "bitness" of your OS to the "bitness" of Workspace. Not much annoys me more when I finally get things figured out, in this case with the help of Olympus, and it turns out I did not do one part of testing that I thought I had done.
The two things I did point out to Tech Support is "better error messages". If the "bitness" of the OS is the issue, don't present a message that says "incompatible hardware". The other outstanding question is why both the 32-bit and 64-bit versions installed on my desktop, I suspect this has something to do with the Nvidia GPU, which is present on my desktop which worked with both versions, vs. the laptops which are Intel only, only the 64-bit version worked. At any rate, match your "bits" and things appear much better.
I can't speak for it as a processor, I happen to use On1 myself, but I now have two ways to get updates and such done.