You will receive an activation key immediately after payment.:
Dying Light - 10th Anniversary Bundle in the GOG system!
This is very important! This is the GOG version! The game is not activated on another platform!

This activation key has no regional restrictions - gog.com

Contents of the set:
Certified Hotshot costume
Priceless Dawnbreaker Shotgun
Shining Sunburst Revolver
Shimmering Golden Idol Machete
Golden Hour Buggy Painting

This product is an add–on (DLC) to the game Dying Light (Dying Light: The Following - Enhanced Edition).
To activate the key, you need to have Dying Light (Dying Light: The Following – Enhanced Edition) activated on your gog account.

Activation instructions:

1) Log in to your GOG.COM account or register a new one if you don't already have one.
2) Make sure that the Dying Light (Dying Light: The Following – Enhanced Edition) game is purchased or activated on your gog account.
3) Go to the key activation section and enter the key received after payment on the page
https://www.gog.com/redeem
. Confirm the key activation.
4) After activating the key, the DLC will be unlocked in the game or available for download along with the game from the Library section.