Originally posted by Kilam
PlayStation Store Games use a different EBOOT thus you get the error. Not many EBOOTs are made for NPUB as most people have BLUS or BLES. I would recommend copying the game over from a CD if you can get one from a friend or such, most tools and EBOOTs don't support NPUB so you won't have much luck there.
Ive tried several times to copy my freinds disc but the damn thing always had an error on files when copying.