Hi!
To Install this skin you need to do this:
1. Unrar ''materials'' folder from your selection (green camo,grey default...)
to Steam/steamapps/common/Counter-Strike Global Offensive/csgo.
2.Next you need to go to csgo and open pak01_dir.vkp (first make backup folder of that file)
with Notepad ++.
3.And you need to find snip_sgg08 and change it in snip_sgg07
and again you need to find w_snip_sgg08 and change it in w_snip_sgg07
4. Go an' play the CS:GO and give someone headshot! ;)