[404UserNotFound]

Hmm, I'm not sure these are the Linux files. After fully downloading everything, the files in the "bin" folder are .DLL's and not .SO's

There's also "steam.dll" and "srcds.exe", as opposed to srcds_linux and srcds_run Linux files.

EDIT: Ahh! It's because the proper ID is "17700". "17705" is the Windows version. And 17700 still returns the "invalid platform" error.