Darth Idoit.
You have to buy whole package. If u buy the newest one it is complete adventures and it has included star wars galaxies empire divided, jump to lightspeed, rage of the wookies and trials of obi wan. Well theres total experience too but it dosent have trials of obi wan so i would sucjest complete adventures. Whole pack is about 30$.
BTW u dont have so much RAM do u? heh 256 it will play but it has lots of lag i would sucjest that u buy either 512, 1024 or 2GB.
Hope this helps.
And Total experience is old fashioned. Just buy the complete adventures. And ul be fine.
Jedi_82