SeduceMePlz: My opinion of the current iteration of Techland was already somewhat low since they don't release their newer games on GOG. Naturally, I don't follow the company closely as they aren't selling their products on a platorm that I'm willing to use. (I do have a PS5, but I don't use it for DLC-heavy games of this sort.)

Enter the "10th anniversary" celebration. This DLC:

Dying Light - 10th Anniversary Bundle
https://www.gog.com/en/game/dying_light_10th_anniversary_bundle

was supposed to be free. However, this doesn't seem to have been communicated to owners of the game, and the offer ended months ago.

Coming across it now, I can't help but think "Wow, thanks for nothing, Techland. Screw you, too."

Seriously, why isn't this DLC perpetually free? All it's doing is counteracting goodwill from anything else Techland does (such as the recent update).

gog2002x: This isn't quite the answer you're looking for, but at least it's a chance to get a copy.

https://www.gog.com/forum/general/the_community_giveaway_6th_edition/page1

There is 1 copy of the DLC and if you post there on the last page and ask for it, you'll likely to get it. Best to hurry, as there is ONLY 1 copy left.

Make sure to follow the simple rules from page 1 and don't edit your post, as that may invalidate the request. Basically look at the examples on the last page and you'll get the idea. It's fairly simple to make the request.
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Edit:
I'm also assuming you have the GOG version of Dying Light, otherwise it would do no good to make the request. Thought I'd at least say that just in case. =P
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SeduceMePlz: Thanks for taking the time to recommend that thread! I'd considered it as a possible option but got busy and forgot to check it until I read your post. :)