Before attempting this installation, ensure your specific machine is compatible. Snow Leopard dropped support for older PowerPC G4 and G5 processors entirely.
A full Snow Leopard Retail DMG should be approximately 6.5 GB to 7.5 GB. If the file is only a few hundred megabytes, it is likely just an update patch, not the full OS. download snow leopard 1068 dmg google drive upd
It has a significantly smaller footprint than modern macOS. Before attempting this installation