Some websites archive old, delisted games. However, Real Steel is not technically abandonware (as the rights are owned by Disney/Reliance Entertainment), so proceed with caution.
Download the latest build from the official RPCS3 website. Install the required PS3 firmware (you can download this legally from Sony’s official site). real steel ps3 iso
Fix: Redownload the ISO. Check the MD5 hash against Redump.org. If the hash doesn't match, your download is faulty. Some websites archive old, delisted games