Override Grav with update archive


I spent the last two days trying out Grav and was very surprised, how easy everything works. When I checkout the grav repository at Github, i find the grav-update-vx.x.zip archives.
So if I have no access to the admin panel or ssh, is it possible to extract the update archive via ftp to override/update the old grav. Or does this action lead to “nothing”.
I read the documentation and understood the best practice for updates. But I was wondering what you can do with the update package.

Thank you in advance,