Mortal Kombat 9 (2011) was never officially released for the PSP or as a native ISO for the PPSSPP emulator. Official versions only exist for PlayStation 3, Xbox 360, PC, and PlayStation Vita.
Legality: Ensure the source of the ISO file is legitimate. Downloading copyrighted material without permission is illegal in many jurisdictions. Mortal Kombat 9 (2011) was never officially released
The provided link, described as --39-LINK--39-, suggests a specific source for downloading the Mortal Kombat 9 PPSSPP ISO file. However, it's crucial to approach such downloads with caution: described as --39-LINK--39-
If you want to play actual Mortal Kombat 9, you have legitimate options: you have legitimate options: