Fortunately, there is a way to force the Android 7.0 Nougat Update to be installed on your compatible device, and all you have to do is:
- Sign up for Google's Android Beta Program
- Click Enroll device
- Accept the terms and then click Join Beta
- Head to Settings
- Scroll down and select About Phone
- Click on System Updates
- Tap the "Check for update" button
- You should see the update available for download within a few minutes
Thant's it your are now running Android 7.0 Nougat on your Nexus 6, Nexus 5X, Nexus 6P, Nexus 9, Nexus Player, Pixel C, and General Mobile 4G (Android One).