What do we do with this ZIP file?
That zip file has been available for weeks. And to installing that update requires you to be rooted and have an unlocked bootloader which will require wiping your entire phone memory. This update being available doesn't really help any of us truly "stock" users who are unrooted and still have locked bootloaders. The only way to get this update without rooting and unlocking your bootloaders will be OTA.

