there i a problem i can't solve.
i have half life 2 , counter strike sorce.
i can open the gmod 9 to the starting screen but i cannot press single player ,mod maneger and create sever.
please help me solve this.
Just downloading the SDK Base 2006 doesn't do anything, you need to tell gmod to use it as codebase too.
Open the gameinfo.txt and change the SteamAppId to 215, should do the trick. No guarantees though.