How to download latest safari

Hi

Safari is part of MacOS so to update safari you would need to update your macOS

see for guidance: Update macOS on Mac - Apple Support

What version of macOS is installed on this computer ?

As mentioned, Safari is built into the version of macOS installed on this computer

There was an updated version of Safari offered from Apple for Monterey and maybe? Big Sur ( not sure on that one ) bring it to version 16.1