An ISO is a digital archive of an optical disc. For PSP games, an ISO contains the entire game data. Legally, you can only download an ISO if you own the original physical UMD (Universal Media Disc) and rip it yourself.
The core issue with the search term "Hitman 3 PPSSPP ISO" is historical. hitman 3 ppsspp iso file download android isoroms repack
You cannot play Hitman 3 on PPSSPP. That is like trying to play a Blu-ray disc in a VHS player. The hardware architecture, graphics APIs, and storage size of a 60GB modern game are impossible to compress into a 1.6GB PSP ISO file. An ISO is a digital archive of an optical disc
When users search for "Hitman 3 PPSSPP ISO file download," they are looking for something that does not exist technically. Most "repacks" claiming to be Hitman 3 for PPSSPP are either: You cannot play Hitman 3 on PPSSPP
In emulation communities, a "repack" usually means a compressed version of a game. A "Hitman 3 repack" for PC is legitimate (like FitGirl or DODI for Windows). However, a "PSP repack" is usually a scam because PSP ISOs are already small (400MB - 1.6GB). There is no need to "repack" a PSP ISO further.