Type in either:
They both take you to exactely the same site.
Once there click on Downloads, then choose Demos or Patches, or whatever takes your fancy.
Good luck, and don't forget to let me know how you got on.
Once at the actual site, choose downloads, and you should then see the patches option a little way down the screen and slightly to the right.
As for the game, the only fault I can find is the usual rubbish commentary which I always switch off anyway.