Massgrave or the good ol’ Windows 10 AME Project ISO on archive.org (using since over a year with simplewall and occasional Kaspersky’s KVRT scans).

I prefer things be talked publicly, because piracy community is small and tightknit as it is.

I have seen an exception - old installer Windows games. For example, yesterday I was installing NFS High Stakes and it was complicated, needing to mount ISO (nocd needs external installer patch that only works with mounting), installing it, running it once and then copying files over to run on Linux. Observed the same even with Razor’s repack combo of NFS Hot Pursuit I and II, which needed running game once on Windows for configuration then successful runs on Linux.

This leads me to the conclusion that either doing this is a good way, or anyway just have Windows 10 by the side on a SSD to ensure no compatibility problems. You can keep running Windows offline even after EOL if you scan files properly, since you will give no internet to it.