The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Fullscreen, Inc.:
The official Fullscreen app for iOS brings our Creator Platform to your mobile device! No matter where you are, you can access your YouTube earnings and channel performance, plus interact with the thriving Fullscreen creative community.View videos and status updates in your home feed, check out creator profiles, find Fullscreeners who are looking to collab, and connect with them through 1-to-1 private messages.The app is available to artists and creators who are part of the Fullscreen network. To learn more and apply, visit fullscreen.net!