The tool color-codes results (even in macOS Terminal):

Yes, if your Mac can read the NTFS drive (via Paragon, Tuxera, or macOS native read-only). Write support is not needed.

Visit github.com/13xforever/pyPS3Checker, click "Code" → "Download ZIP", then unzip it.

No. pyPS3Checker is for disc-based backups (ISO/JB folder). For PKG verification, use ps3pkgtool.

Assume you have a PS3 ISO located at /Users/yourname/Downloads/BCES12345.iso.

python3 ps3checker.py iso /Users/yourname/Downloads/BCES12345.iso

Output explained:

If you see BAD DUMP or CORRUPT, the file should be re-dumped.