Did any of the demos work for you? You may need to try virtualization such as Oracle VM or something else. Make sure that the games aren't being read as false positives by any virus protection, and make sure utility.dll is present wherever you extracted the .exe.
Hello! Interesting idea you got going. It's not bad, but off the bat from playing the demo, I'll say that the CPU needs to actually attempt to grab the player, grabs need to be easier to pull off (maybe nix the special bar or make it cost less), and grabs need to decrease the opponent's health instead of increase it. Also, would be nice if you threw some optional ground recovery in there, but that's just a personal preference.
Kudos on actually having a demo though! There are too many of these small games that don't bother having one.
The only other thing I can think is that you're somehow missing utility.dll in the game folders?
Otherwise, this just makes no sense. Frankly, I find it absolutely incredible that the games somehow stopped working on BOTH your standard system, AND the virtual machine, after already having worked...
Did the VM change somehow? I would say it's a registry error that seems to happen to some people, in which case I would try using sfc/ scannow in the command line. I've never had this problem, as all the games still run fine on both my updated PC as well as on a decade old laptop, without any issue (although some games are slow on the laptop), so I'm never entirely sure how best to troubleshoot it.
Flash and Unity are two completely different architectures. Importing the games would take way too long.
With instances of this I've seen in the past, it's been the case that those people have had some registry problems. Other than that, don't know why it wouldn't work.
