The following instructions are appropriate if you need to download Source code. Note: If the tools do not launch, check the environment variables on your computer and change VProject to the directory where gameinfo.txt resides Installation of source code and launcher The tools are located in the respective bin folder for the game (e.g: /steamapps/common/Team Fortress 2/bin) and are meant to be launched from the following batch files: Note that the tools are only available for Windows. The SDK tools are currently shipped with the game by default. Valve moved towards a model more similar to L4D and CS:GO. Previously these tools were distributed together under the "Source SDK" tool, which resided in a totally different folder from the games. Valve in 2013 changed how authoring tools were distributed for Team Fortress 2, Counter-Strike Source, Day of Defeat: Source, and SteamPipe migration and abandonment of the Source SDK app
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It is used to develop mods and content for the Source 2006, Source 2007 and Source 2013 engine branches.
The Source SDK is freely available to all Steam users.