Sir_Dupre: I'm having the same problems, got the redeem codes, but no link to that promised extra game, although pre-ordered.
I'm new to GOG, is it possible that we'll get an extra e-mail in the next few hours maybe?
It is always possible if you contact them first. Because before this, there are certain issue in GoG that prevent the email reach some of the customers during the first few days of the pre-order. But later, they resend the email to all the customers.
Just drop them an email.