There is only one patch. The patch can be downloaded
here at Ironworks. The effects of the patch are explained by Sazerac on
page four of the Best Tips thread and by Bungleau on
page eight of the same thread.
I, personally, do not recommend the patch. The few irritating glithes that it fixes are not a big problem, and the benign bugs that can be exploited without the patch far outweigh the negative sides.