Created by TF2 fans as an alternative to TF2. We have additions that you wouldn't see in live TF2 including Deathmatch, 4 teams and more classes!
Download the client.
Once downloaded, extract everything to your "steamapps/sourcemods" directory. You should now have "steamapps/sourcemods/tf2classic".
3. Install Source SDK Base
Go to the 'Tools' section in your Steam client and Install Source SDK 2013 Base Multiplayer.
4. Restart Steam
Once it has finished updating, restart Steam
Check your games. You should see "Team Fortress 2 Classic" has appeared on your games library.