The single player d/l is the "trial version" to see if you like it. Heh, but thats what everyone uses on Closed anyways. It works just fine. The only thing is it says Trial Version in the middle of the screen and you can't get tech help. Mines been runnin great for almost 2 days straight though. This 1.11jsp is soo much easier to setup and so less buggy than the older ones.