The unlocked Samsung Galaxy S7 edge can now be updated to Android Nougat
If, for some reason, you don't have Smart Switch (although you should, as owner of a Galaxy S7), you can download the software on your PC or Mac via the second source link below. Once you have Smart Switch on your computer, connect your phone, open the application, and you should see a notice informing you about the Nougat update. As you can see in the image below, we're talking about Android 7.0 Nougat here, not 7.1, but the thing that matters the most is that you'll finally get rid of Android 6 Marshmallow.
sources: Samsung Community, Samsung Smart Switch via XDA, Android Police
Things that are NOT allowed: