I just downloaded 12-ubbthreads-7-5-6p2 and in there are 4 directories which contain the files inside thats needed. If you are already upgraded to 7.5.6, look on the right side which has the patches and download the top one 12-ubbthreads-7-5-6p2.
Sounds like you downloaded the full 7.5.6p1 install, no need. Just download the patch if your already running 7.5.6 and upload those few files and you'll be good to go.
