Johnathanamz: I think gog.com needs to update the Operating System (OS) and list Windows 8.1 as well not just windows 8.
gog.com please make the video game developers who don't have support for Windows XP, Windows Vista, Windows 7, Windows 8, and Windows 8.1 to have support for all of those Windows versions.
Should they list Windows 7 SP1 separately from Windows 7 RTM, and Windows XP RTM, SP1, SP2, SP3 separately as well?
Admittedly, Windows 8.1 isn't installed via Windows Update, but through the marketplace, but beyond that, I fail to see how it's any different from any other service pack. Instead they should generally assume that anyone running 8 has installed the 8.1 update (just as they should assume a Windows 7 or XP user has the latest service pack and other updates).