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 NFS Hospitality:
Rendezvous Workspace Room Display app provides an interface to Rendezvous Workspace desktop application providing a mobile, meetings management solution. Schedule or amend timings of future meetings and current bookings from your mobile device.