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My pacs are in private > wii > app > RBSE > pf . I just extracted the files exactly the way they were given on the .rar file.
Also currently trying to put new textures from a pack I just got on there as well. Haven't done it yet as I'm not sure Brawl-'s codes work the same way with these textures.
You need to drag everything in the brawl- zip to the root, not to the pf folder.
But if you want to do it manually..
They need to be in
private > wii > app > RBSE > pf > fighter > [individual character folders]
But really....
You should just back up your current private folder, and move the minus one to the root.
Though you might not need to, when i opt to replace private folder with minus private, it doesn't delete anything, might replace stuff if they have the same names, though.
I don't know if it will work that way for you, though.