Use SteamCMD if you absolutely cannot install the Steam client. It gives you a clean, official, and portable version without GUI bloat. One-Click Summary (for quick reference) 1. Download SteamCMD from valve. 2. Run: steamcmd +login anonymous +force_install_dir ./sfm +app_update 1840 validate +quit 3. Go to ./sfm/game/bin/ 4. Launch sfm.exe 5. (Optional) Add assets from other Source games manually.