The game can be obtained in any number of ways, if you do enough searching on the internet.
There is a free demo available at 
It should be noted that this game can be hard to obtain due to the fact that the manufacturer has stopped producing it. Given that, you can often find this game off many torrent search sites. The original game is around 2.4GB and the expansion is around 1.68GB. This should only be done as a last resort if you cannot find the game anywhere else.