thats what i did. i downloaded the server with appid 740 -beta 1.38.7.9 validate and in my steam client at cs2 i select csgo_demo_viewer 1.38.7.9 and now when i start cs2 i can select cs2 or demo viewer. so i choose demo viewer and load the old csgo and can connect to my 740 server and playing csgo and not cs2.
edit: 730 downloading both, csgo and cs2 (game) dir.
