Motorola has begun rolling out Android Nougat to unlocked Moto Z smart devices. Android Nougat 7.0 is being released not latest 7.1.1. This update is exclusively for unlocked Moto Z devices in the United States.
This Nougat 7.0 update is available over the air. If you receive a notification on your device that an update is available, click on "Yes I'm in". That software will now download.
Click on "Install Now" after download is complete. Once that software update to Nougat 7.0 is completed, your device will reboot. Not all Moto Z device owners will receive this update right away.
Until then, you can browse to "Settings" then choose "About Phone". Click on "System Updates" to check to see if Nougat is available for your device. You want to have a well charged battery or better yet hook up your devices ac adapter during this upgrade.