Well, I bought this key some months ago in a groupees bundle (build a bundle #33), and apparently (according to the forums here) they had some issues with dupplicated keys for this game (subject I was not aware until now).
I wrote a support ticket to them requesting a replacement. If they replace it, I'll update the key and I'll let you know. If they don't, mark the giveaway as not received after a week has passed.
Sorry for the inconvinience.

I've replaced the key with one groupees sent me by email. Please try it, and let me know if it works.