Installing and Launching Tools
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Half-Life SDK is a optional free downloadable SDK, available when you own 
Half-Life or any first-party GoldSrc games (such as 
Counter-Strike, 
Team Fortress Classic, etc...). If you want to create mods, you must install the SDK first.
Installing the Tools
You can install the Half-Life SDK by clicking here (it will either ask you to install or launch the tools, or possibly launch 
Hammer),
or you can following the methods below:
- Open the Steam window.
- Go to the Library.
- Change the list to Tools.
- Find and double-click on the Half-Life SDK item, or you can click on it, then click Install.
- Read over the dialog box and make sure you have enough space, then click Download and Install / Next to continue
- The Half-Life SDK will then be downloaded to your computer via Steam.
Launching the Tools
- To launch the tools, press the "Play" button when you select the Half-Life SDK (or right-click the game in your library and choose Play).
Congratulations, you have installed the Half-Life SDK!
Create a First level
Now that you're in the tools, it's time to design your first level and much more.