This theme won't be updated anymore. Support ends with Nougat. You need root and a rom with Substratum support to use this theme. If you don't know what I'm talking about, please don't download this theme because you won't be able to use it.
It's free to get the installation package of View Nougat Theme, also, you can read users' reviews on Droid Informer. The app works fine on Android 6.0 and higher. This download is completely safe. Gianluca Spadazzi has developed this application that falls into the Personalization category.