GOG Game Key Activation
Login to your GOG.COM account
Enter this link: gog.com/redeem
Enter your code and complete Captcha task and click "Continue"
Confirm your redemption by clicking "Continue"
GOG Game Key Activation 2
Copy the link you have recived and enter the site. Once you copy the link to your browser you will immediately land in the code activation page and see your code already there
If you are not logged in, you will be asked to log in to you GOG.COM account.
Confirm your code activation by clicking "Redeem"
Code redeemed successfully