How to play CS:GO after the release of CS2:
1) Download "csgo_legacy" from CS2 beta branches.
2**) Replace the first line in "C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\steam.inf" with "ClientVersion=2000258".
3*) Click "Add a Non-Steam Game" in Steam.
4*) Add "C:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo.exe".
5*) Add "-steam" to the launch options.
** - Fixes inventory and community servers browser.
* - Optional for convenience.