https://wccftech.com/dying-light-bad-blood-free/

The Dying Light Bad Blood expansion can now be downloaded for free through Steam for those who own the original Dying Light.

 Developer Techland announced the news on Steam. Regardless of the platform on which players own Dying Light (PC, PS4, Xbox One), players can visit Techland’s docking site on Steam to claim their free copy of the standalone Bad Blood PvP expansion.