My understanding is that you have to have the x-pack for the Star Wars mod. Patching Sins to the latest current version will include their Steam competitor, and the expansion is $10. Definitely get the hang of the game first, though, to see if it's something you like. It's VERY intricate and one of the best economic sims I've ever seen. The tutorials are great, and you can always hit me up for some advice or a game--I'm usually on Steam when I'm online.