When you download the pack, there's a private folder (or a projectm folder, if you're using projectm), and this needs to go on your SD card too along with all the files in it. You might not have those files, or if you do, they might be in the wrong place.
I replaced the entire pf folder with the pf folder from the download pack as well as the codes folder with the codes folder of the download pack. I'm pretty confident they're in the right place. Both Brawl and the files for Project M run off of my HDD, but I can't imagine that would be the issue.