CD-key invalid?

[KnightHeart1]

I bought three copies of Amnesia from an office depot that was closing near my house (around November)(both are 14 characters long) one for my self, and two for my friends. I activated my key no problems, now in December and when they try to input their new gifts, they get invalid CD keys? Why ? these are legit copies and my game works fine can i get help with this so they can enjoy the game and stream it like i did?

[plutomaniac]

No matter the problem, CD keys for Amnesia are no longer used. After installing the game, download the latest update (v1.3) and it should not ask for anything more to run.