Alright, I hope I didn't miss anyone. It has happened.
As far as I can discern at the moment, there are 26 qualifying entries, and I apologise for not responding to the other five sooner, I haven't exactly been sitting here to look as the entries drop in (on vacation, and thus a lot more busy than when at home).
I could ignore the disqualified ones, and have them hope they were included in the draw, but I do prefer to be honest.
Dzsono, Feyling, kojocel, mrcrispy83 and Witchfynder. You were not included because you did not include proof enough that your screenshot were taken from a modern system (the games were too old, and the system wasn't shown - either being rectified would qualify). This is why Snickersnack's Quake 3 was qualified (Windows 8 was visible while the screenshot was still a correct size) while Witchfynder's was not.
The winner today is a face I haven't seen before, bbls2097. Please accept a gift of Kingpin: Life of Crime, MDK 2, MDK, Earthworm Jim 1 + 2, Sacrifice, Redneck Rampage Collection, Fallout Tactics, Fallout 2, Fallout, Messiah, Lionheart: Legacy of the Crusader, Descent 3 + Expansion, Giants: Citizen Kabuto, VR Soccer '96, Kingdom: The Far Reaches, Evolva, Screamer, and Shattered Steel. As mentioned earlier, if you already have some of them on GOG, it will still be valid for those after you have redeemed the code, and you can pass it on to another. You shall receive it shortly.