This is not a standalone application you need to have installed, Nova launcher as well as Kustom Live Wallpaper pro and Kustom widget pro.
The designs are my own based on my imagination and some on someone else's designs that inspired me.
Here you can find videos that help you understand the operation and installation of topics of this type.
https://m.youtube.com/channel/UC-ZYvpDXGw2kp_iABBZr07g
Thank you.