What is the difference between the Windows x64 and the Windows x64 (non-fixed) versions? The only interpretation I can come up with for "non-fixed" is "bug fixes not applied", but I can't imagine why you'd be offering that for download...
That's a good question, I unfortunately didn't find a truly good name for it. The current public version of the game uses Edge to run itself. The "fixed" version has an embedded version of Edge included so that it doesn't run into any issues related to an outdated version of Edge. The "non-fixed" one doesn't include any version and simply uses the version of Edge that is installed on your system.
The upcoming version won't have this issue, luckily
I hope that makes sense! :)