H3PC4T: Redeemed - Thank you!
Edit - Maybe not, hasn't appeared in my account - yet.
Drakon135790: the fact that the game has not yet appeared in your games library only means that there is a lot of interest in the game, making it appear in your account late
Probably true; the GOG system is severely broken under heavy load. I've seen the following happening in the cases where you'll have to wait many hours:
1) While it hasn't appeared yet, you can "redeem" the same code over and over again, each time GOG will say: "success".
2) If you redeem really quickly 2 times in a row, GOG will say that YOU already did so instead.
3) During the "overload period", it doesn't matter from which acccount you "redeem", the messages will always be the same as above.
4) The first "redeem action" will actually "win" in the end.
The above 4 points are my assumptions derived from the following observations:
A) Trying "ninja" codes, I've seen the behaviour from points 1) and 2) mentioned above, but many hours later the message changed to the "true state" that somebody else had redeemed the code.
B) Trying codes I've received "exclusively" (so nobody else could redeem them meanwhile), I also got the messages from points 1) and 2) above, and many hours later, the game actually appeared in my list.