I am also having a similar problem. The first patch went through just fine, then on the new patch, It says the download is complete, but doesn't start the patcher. The only thing you can do is hit the cancel button on the update screen, and then the file that is downloaded in the KOTOR2 temp folder, when unzipped has a .RTP file that cannot be run and is not recognized by the program finder.
If anyone has any help on what is wrong or what can be done that would be great.
P.S. also, the reason I'm asking about the new patch is because I just got a new computer that should run the game with no problems. But in certain areas of the game, the game runs very slowly, to the point where the screen rate jumps you ahead halfway down a hallway and the character won't respond when you try to move them. I was wondering if there was something I was missing as my comp should be running this game and making me coffee at the same time. Also, the game says that my drivers are out of date, but I have Catalyst 5.5 drivers installed and running.
AMD Athlon 64, 2.2GHz
ATI Radeon 9250, 256MB - updated drivers to Catalyst 5.5, and directX 9.0©
512MB RAM.
Thanks for any help