EnjoyRC, we have found the cause, fix and a workaround for your initial issue. See here.
I wonder what your issue is with install an older version if the newer one is still there. It should works straightaway (the only thing is that you are probably left with the newly introduced eLoopStutter that is not removed). Do you remember what kind of error it was that you saw?
Did it look like this?
This is a not an error, this is a strange quirk of the installer framework that we use that sometimes happens. You can then still select your drive and continue installation.