Yep. Some people have dealt with this problem. Of course, yes. Source mods not showing up on Steam. I downloaded them from this site, but they don't tell me which Source SDK Bases I need. I have five mods, let me show you which ones work and which do not:
Mods that work:
The Stanley Parable - HL2 Mod
Mods that don't work:
portalhot - Portal 2 Mod
aperture_ireland - Portal 2 Mod
I have mods that I keep deleting and installing, they don't work, what do I do?
I installed more mods, they crash.
I found some files to fix the mods, nothing happens in my Steam Library.
The SteamPipe patches were a failure. Is it because I need to own the full version of the game? Because some of the game's files do not appear in the folder.