Go to the JK2 official website, go to community, go to the first web page listed ( it the top left corner) Jedi Knight 2 . net
Go to the files (you may have to register but I don't think so)
Go to the Essential Files (open that)
Find the version 1.03 patch and DL it.
then unzip it open the read me note book for installation instructions.
That should take care of your problem.