Windows 8 and 8.1 is no longer officially supported (all games)
Historically, most technical problems reported were related to Win 8/8.1. By this I mean like more than 50% reports total among all games, ever reported. I would say, it’s the most troublesome system ever released. In addition a very minuscule number of people use it nowadays, and even those who do, seem to have a second OS on another machine anyway. Which also means, I have harder and harder time to find testers to test it on that machine. The last thing is, I use various third party software for the engine and, well, let’s say that the maintainers of this software do not treat Win 8/8.1 support as a priority. All this combined lead me to decide it’s time to stop supporting this OS.
Note that Windows XP is still supported (at least for now).
Windows 11, Windows 10, Windows 7, Windows XP.
Linux (flawless emulation on Linux via any compatibility layer, especially Proton, regularly tested).
Mac (unconfirmed, but I got reports it runs without problems on M1 Mac via emulation).