While it's technically possible to search for "I.G.I.-2: Covert Strike PPSSPP ISO" online, the reliability of these files is often questionable. Downloaded files from unofficial sources can be corrupt, contain unwanted software, or be incomplete versions of the game. The most reliable method to obtain a high-quality, uncorrupted ISO file is to rip it from a UMD you own using a custom firmware PSP or a specific UMD drive on a PC.
The easiest method. The original PC game runs on almost any hardware today. Igi Iso File For Ppsspp
The Ghost of the Machine: The Enduring Legacy of Project I.G.I. While it's technically possible to search for "I