This theme is only for CM13 & other Marshmallow ROMS supporting CMTE. As we don't have CMTE for Nougat yet, all we can do is wait, or use Substratum instead. To get this theme on Nougat or Marshmallow supporting Substratum Visit. A simple minimal light theme with 3 variants, Greyce.
This application is totally secure for downloading. Harsh Shandilya is the creator of the app which refers to the Personalization category. [CM13] Greyce has been downloaded and installed by over 5K users and the latest update was released on Mar 7, 2017.
This application has the overall rating 4.8 on Google Play. Get the installation package of [CM13] Greyce 1.8 that is absolutely free and take a look at users' reviews on Droid Informer. The app runs flawlessly on Android 6.0 and higher.