In order to get your DLC for free, you need to:
- Visit Gemly.com website and press "ADD TO CART" button
- Log-in with existing, or create new, Techland account
- Follow link from the e-mail and activate account
- Add free DLC to cart again, visit "My games" page and press "CLICK TO REEDEM" button.
You will be redirected to the page with Steam key. Base game is required to activate this DLC. Merry Christmas! :)