/dev_hdd0/game/BLUS12345/ └── USRDIR/ └── DLC/ └── data.bin

Format your USB to NTFS . Plug it into the PS3 and use a homebrew file manager like Irisman or multiMAN to copy the PKG from the NTFS drive over to the PS3's internal hard drive directory: dev_hdd0/packages/ . Once copied, install it via Package Manager > Install Package Files > System Storage .