Yes its possible and infact I just installed CS GO for offline LAN in our gaming zone (CrashPad) and its runing absolutely fine. If you guys wanna know how let me know and I'll write a step by step small giude here. Of course im just talking about offline LAN without Tunggle which is very simple and u can even connect to ur friend's server even if its not on ur Lan but for it u have to be online.