the Demon's Souls download?

I spent hours waiting for the download for Demon's souls, but I can't get it to run on my PS3 Emulator (RPCS3). It seems to me like there is no actual game, just the files used for the game. Am I not supposed to extract it like every other rom?

what type is the downloaded file ? is it an archive file like .rar or .zip ? if so then you have to extract it .you could go through this quick guide thread, or check some youtube videos.

demon souls fix the ps3_disc.sfb file is corrupt so i replaced it with one from another game
it now works