dude MP is included in the game. You need to load it from another exe though if I remember it. Also you can use the game launcher, I personally don't, but it would help if you cannot find the file.
When the game launches you have the option for multiplayer. If forwhatever reason you don't, then go to My Computer>C:>Program Files>LucasArts>Star Wars JK II Jedi Outcast>GameData and in there you will see a .exe file called "jk2mp". Right click it, then click send to then click desktop (create shortcut).
Linear Mode
