Step 1: Go to the below link and check that box which will subscribe you to Fanatical's newsletter.
Step 2: Then click on add to cart.
Step 3: Now you will be asked to login to your Fanatical account or sign up to a new one.
Step 4: Then you should link your Steam account (limited Steam accounts are not vaild for this, means you should spend 5$ on Steam with the relevent account.)
Step 5: When your order placed go to orders and keys. There will be your order, just click on it then click on reveal key. Finally click on Redeem on Steam button.
» Ends on Nov. 30