Win Metal UI is a beautiful user interface with a very elegant style. Only apply it with the launcher of your preference in the following way Open the Win Metal UI application and go to the upper left menu -Select set or apply. -It will show you the launchers supported and in the first place the ones you have installed. -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. -You can also open y