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Installing Third Party Mods

How do I install and use 3rd party games (mods) in Steam?

If you have a Half-Life mod installed before installing Steam, Steam will automatically convert and install the game for you.

It will then be accessible in the Steam "My Games" list under "Third Party Games."

NOTE: ALL THIRD PARTY GAMES FOR HALF-LIFE 1 ARE INSTALLED UNDER "HALF-LIFE".

So for example, there will be folders (just a few example names):

C:\Steam\SteamApps\<account>\half-life\action
C:\Steam\SteamApps\<account>\half-life\aghl
C:\Steam\SteamApps\<account>\half-life\bg
C:\Steam\SteamApps\<account>\half-life\biglolly
C:\Steam\SteamApps\<account>\half-life\firearms
C:\Steam\SteamApps\<account>\half-life\underworld
C:\Steam\SteamApps\<account>\half-life\valve <----- the original Half-Life game

If you want to add a Half-Life mod after installing Steam, you need only to put it in the Steam/SteamApps/<account>/Half-Life directory.

For Half-Life 2 mods, you need to install them in the following directory.

C:\Steam\SteamApps\SourceMods

The next time you open the "My Games" list, it will be listed under "Third Party Games."

If updates for your 3rd party MODs become available, you will need to manually install the updates.

If you get an error about your client.dll is different from the server, this is a good indication that you might need to update your 3rd party MOD.

 

Problem with Steam?

Contact Steam Support