Steampunk is an icon pack. It is not a stand alone application, you need a third party launcher to apply it.
***Note***
Please check the following videos on how to setup your phone with Nova and Niagara launchers:
Nova Launcher:
https://www.youtube.com/watch?v=B0npv8Z5sW0
Niagara Launcher:
https://www.youtube.com/watch?v=f3dvqiXTwC4&list=PLOvXK6kvTwvlCViyD1_BK3URZbPafQ5nN&index=4
What's included:
★ 2.564 HD icons (256x256)
★ 24 matching HD cloud wallpapers!
★ Launchers support: Action, Adw, AdwEX, Apex, Atom, Aviate, GO, Next,Nova, Smart, Solo...
★ Icon masking for un-themed icons
★ Dynamic calendar (For Nova Launcher)
★ Alternative icons to choose
★ Updates.
