Make sure that there is a SourceForts folder in C:/.../steam/steamapps/sourcemods/.
If it is not there, install has failed. It is possible that it tried to install it to the wrong place, in which case search your computer for SourceForts and move the folder (should it find it) into /sourcemods/.
If it isn't there, check the installation directory on the installer itself.
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fljo: this game sucsk and kukshna/khuskan thinks he to good since he a [dev[
Sourceforts only needs HL2DM and not the free version. My 2nd account only has HL2DM on it, not sure if SDK base is needed or not as I have it installed fo other mods.