This goes in the editing forums, actually. I'll send a report, so the mods should move this soon. :)
But to answer your question, you have to put the files you downloaded into your SWKotOR 2/Override directory. If you don't have a folder called 'Override', you should make one.
About how you said you couldn't access the file, is it in .rar format? If it is , you should download this. :) (
http://www.win-rar.com/download.html)