You can't there might be some mod that lets you, but in the normal game you can't us one.
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Star wars Jedi Knight: Jedi Academy costs atleast 100$ when i bought it.
No it does not. But Jedi Academy does.
In short, no. You could always buy a toy light saber and pretend you are learning to be a Jedi, though. :(
Yes, it is available for Mac OSX. It should be carried by most Apple Retail stores, and can be found online in many different places.
u suck