I didnt download it. I bought it and I get a similar error.
Your game version is: 2.00.424 English
...
Patching File swkotor2.exe
Patching File TexturePacks\swpc_tex_gui.erf
An incorrect version of the file was found on your system.
The update was unable to complete, since the file contents were incorrect.
C:\Program Files\LucasArts\SWKotOR2\TexturePacks\swpc_tex_gui.erf
File Size: 132776589
File CheckSum: 36db908972403f3c09049844148b7446
Get the manual patch.
http://support.lucasarts.com/patches/Kotor2.htm
The patch has been aborted
Any help?