Look for the "Download PS3 Update" button. This will download a file named PS3UPDAT.PUP .
However, the emulator is only half the battle. To play your legally backed-up PS3 games, you need the . Specifically, the keyword making rounds in forums, Reddit, and tech blogs right now is "PS3 Emulator Bios V1 1.7 Download Fixed."
RPCS3, the only highly functional PS3 emulator, does not use BIOS files. It requires the official PlayStation 3 system software in Outdated Information: