This application, like any icon pack, is not a standalone application, because to use it you need an extra launcher such as nova launcher or smart launcher.

*Instructions*
Open the Cirgus UI application and inside it go to the menu that is in the upper left.
-Select set or apply.
-The list of all the supported launchers and those installed in the first place will appear.
-Select the one of your preference and press accept.
-You do not have any installed launcher just select it and it will take you to the download link of it.
-Your icon pack is ready.

*Characteristics*
-4000+ Custom icons.
-85 Custom wallpapers.
-Intelligent request of icons via email.
-Application easy and simple.
-Support for the following launchers:

Nova launcher, Smart Launcher, Abc launcher, Action Launcher, ADW Launcher, Apex, Launcher, Aviate Launcher, CM Themes, Evie Launcher, Go launcher, Holo Launcher, Holo Pro, Lucid Launcher, M Launcher, Mini Launcher, Next Launcher, Nougat Launcher, Solo Launcher, V Launcher, ZenUI Launcher, Zero Launcher and more.

-It is not compatible with the default launcher of your samsung or huawei phone.

-Support limited in launcher go launcher because it does not support masking icons.

-This package of icons uses the CandyBar board.

-Support Muzei

-Interface Graphic in several languages.

-Make your requests and you will receive an immediate response.