1. Install the apk
2. When it's done, wait a moment. Then check your theme store.
3. Choose the theme. Then tap on purchase. Dont worry its free.
4. Then it goes to another theme, but dont worry. Let the theme download automatically.
5. Apply the themes.
This theme is based on a theme in Samsung Theme Store which named Lunar Eclipse. So, before install this theme, make sure LunarEclipse is not installed. By the way, i very appreciate LunarEclipse. I just edit the wallpaper and the some icons.
Screen Shots:
This work on my Galaxy J5.
Link : http://sh.st/KwnKr