I bought the game from the website, offer version Steam + standalone. Steam version works fine, the problem is the standalone.
The link of the email you sent me to preorder and that should allow me to download the standalone version of Grimrock gives me this error: "Unknown key! Sorry i could not find this key." asking the mail. I tried to request a copy of the key, the same error.
I opened a topic in the Tech Support forum, the link is as follows:
viewtopic.php?f=12&t=609
As you can see are not the only one with this problem, renewing the compliments for the great job I hope an answer to solve the problem.