Hello.
This game is free if you meet one of the following conditions…
1.) you already have a Deep Silver game in your GOG library.
2.) you purchase a Deep Silver game during the current sale, til 22nd of March 2 PM UTC.
Game Description:
A zombie outbreak eradicated all hope of returning life back to normal, now only survival lives on. Run, hide and fight your way through the undead as Randall searches for his family in this gorgeous, gritty, destroyed world.
Thanks for posting this. 
To clarify to everyone:
- Log into your GOG account. You’ll see the game has a price on it.
- Add the game to your purchase basket. Now go to the checkout page.
- If you are eligible to get the game free, a 100% off coupon will be applied automatically at checkout.
If you follow this forum section regularly, a Deep Silver game called Metro: Last Light Redux was given free by GOG previously. If you claimed a free copy of this game on GOG previously, then you can claim a free copy of Deadlight without spending a single penny.
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