alright guys! here is solution how to play gmod9 without errors
1. go to yours steamapps/sourcemods/gmod9 and find gameinfo.txt
2. open it
3. find the SteamAppId 220
4. change for 215
5. close it
6. restart steam
7. ???
8. PROFIT!!!
if some old mods like smodtroopers dont work do the same as this!
teh_1s0t0p3
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