You can use the PPSSPP for Windows or Mac.
While highly compressed files are convenient, there are a few things to watch out for: Bully Psp Iso Highly Compressed
A standard Bully: Scholarship Edition ISO for the PSP is approximately 1.6 GB. A "highly compressed" version reduces this file size—often down to 300 MB to 600 MB—using advanced compression algorithms like CSO (Compressed ISO) or archiving formats like ZIP, RAR, or 7z. You can use the PPSSPP for Windows or Mac
Where you play determines if high compression is worth it. Bully Psp Iso Highly Compressed