Is this a standalone expansion? I don't have the game installed anymore and certainly don't want to go through vanilla just to play the DLC.
the TechLand guys answer this question in the video below (24:49 mark)...Question: Will you have to complete the main story of Dying Light to play the new DLC?...Answer is No but they recommend completing the main story first...
https://www.youtube.com/watch?t=1621&v=FwNpilWUV3s