The original Crisis Core: Final Fantasy VII ISO file size is approximately . While that was manageable on a standard PSP Memory Stick Duo in 2007, modern emulation on smartphones (PPSSPP) or low-end PCs often benefits from smaller file sizes. A highly compressed version can shrink that file down to anywhere between 300 MB and 800 MB .
: You can find the standard US version of the game (ISO) at the Internet Archive , which is generally considered a safer repository for legacy software. crisis core final fantasy vii psp highly compressed link
Use 7-Zip (free) to extract the downloaded archive. You will get a .cso or .iso file. Do not run any .exe files disguised as ROMs. The original Crisis Core: Final Fantasy VII ISO
: The game features a real-time battle system where you can freely move Zack, attack, dodge, and use magic. : You can find the standard US version