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I'm pretty sure this is their previously released SDK (though a new release for 2013) which is already available through Steam. What's new here is that they've

I'm pretty sure this is their previously released SDK (though a new release for 2013) which is already available through Steam. What's new here is that they've put it up on GitHub.

catmanjan 13y ago
I wouldn't know since I don't have Steam
- dubcanada 13y ago
  All previous versions of Source SDK are widely available on their own system.