This mod (named "Narodnaya Solyanka 2016" by the developers) was developed only in Russian. I've personally hand-translated the mod to English. It also contains a third-party weapon pack, updated textures, shaders, addons and many personal fixes.
Found this poster in a new hidden place. Can you find it? Hint: it's in the Dark Valley :)
That new hiding place with lab-like doors?
Yeah, nice place.
The guy in the poster is on "medical/sick leave":)