Proper fix, for the game closing when launching 2018.
First, go to your "2018 March" install folder -> and go into the "csgo" folder.
Find your steam.inf config file, and open it.
It should say something like "ClientVersion=650" and you need to change that to "ClientVersion=2000258"
When you...
So, if your csgo is crashing on start (2018 version) there is one way to fix this.
You wanna replace the "client.dll" in F:\Program Files (x86)\Steam\steamapps\common\2k18csgo\csgo\bin (your 2018 csgo folder)
with the "client.dll" that you gonna download from here.
Simple as that!
Hope this...