Extract included folders into your Gamedata folder.  If you already have an existing plugin that KAX requires, use the lastest version.

See the official thread for details: http://forum.kerbalspaceprogram.com/threads/76668

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KAX wouldn't be possible without Firespitter!
Big thanks to Snjo and the Firespitter mod & plugin: http://forum.kerbalspaceprogram.com/threads/24551




