This theme does not work as a standalone application.

To use this theme, the installed Total Launcher is required.
https://play.google.com/store/apps/details?id=com.ss.launcher2

The following free widgets are used in this theme:
Simple Calendar Widget
https://play.google.com/store/apps/details?id=de.j4velin.calendarWidget
1Weather
https://play.google.com/store/apps/details?id=com.handmark.expressweather
Musicolet Music Player
https://play.google.com/store/apps/details?id=in.krosbits.musicolet
USSDDualWidget
https://play.google.com/store/apps/details?id=com.mdnsoft.ussddualwidget

The application is used to switch WiFi, Bluetooth, Hotspot and sound profiles.
More Shortcuts (free)
https://play.google.com/store/apps/details?id=com.ss.moreshortcuts
You can also use a more advanced application Power Shortcuts (paid)
https://play.google.com/store/apps/details?id=com.ss.powershortcuts

To display this theme correctly, you need to install the specified widgets and programs. But this is not mandatory and you can use your widgets and additional applications.