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where can i get it

Its automatically downloaded through Steam.

ic

is it part of an update?

Yep, if you have Steam now, and have used it regularly, it's probably already downloaded, you just never relized it. When creating a server, theres a tab that allows you to put in the bots, but if you just want to kill bots, make sure you make it an LAN game, or put a password on it, so nobody joins.