the map is very dark in the pripyat section

Its ok, the map is compiled in fast, this week i'll upload the definitive version.

Now pripyat does look normal. Fixed!

my bushes dont show textures, one of the bush textures which is abundant shows no texture

I think that may be your problem as i have a pc with no resources installed which works perfectly.
There's some bushes wich their textures shouldnt all appear (their leaves) as they were dead, but if you see purple/black textures you should check your addons then.
(I've checked it on hammer triying with the resources downloaded directly from the addon and works just perfectly)

ok

Happy to help anyway! Tell me if you fixed it.

now that i boot it up, isntead of purple and black textures its just black

I would really want to continue helping you, but this error isnt happening to anyone except you. Check you addons, if not, dm me through steam and we'll try to fix it.