Installing

1. Download

Download the client.

2. Extract

Once downloaded, extract everything to your "steamapps/sourcemods" directory. You should now have "steamapps/sourcemods/tf2classic".

3. Install Source SDK Base

3. 1. Installing

Go to the 'Tools' section in your Steam client and Install Source SDK 2013 Base Multiplayer.

3. 2. Changing branch

After it's installed, right click it and select Properties, then click the Betas tab and choose "beta_test".

Close the properties and it should begin updating.

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.