I've uploaded new versions of the SourceOP installer and manual install zip that should work with the SteamPipe versions of the games including HL2 Deathmatch. I've moved SourceOP's custom models, sounds, and materials into the custom folder, but this is optional for existing installations. If you have an existing installation, just update the DLL/so file and DF_funcoffs.txt from the zip file and you should be fine.