The fullsdk.EXE file you have requested: Tools and Utilities / SDK / Half-Life SDK 2.1 (Full SDK) - 74.15mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:

The Software Development Kit contains source code and tools for creating your own Half-Life add-ons.

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