This is a manager app where from you can manage YouTube Vanced or YouTube Music Vanced, like update, install or uninstall, language or theme choose, etc. Also, you can call this app as an installer app which gives you features direct download and install YouTube Vanced app without wasting your time. (Note: Google has moved to split APKs format since the YouTube v14.41.52 update. The Android package installer still does not support split APKs, so use the Vanced Manager for installing Vanced apps.)