The Q-Cal Booking app is easily updated directly from App.q-cal.net.
This guide works from Q-Cal Booking app 2.0 and up.
If the app is version 2.0 or below, follow this guide instead. Q-Cal booking App - ProDVX
Go to Views > Meeting Room displays.
Here all active screens on the account can be seen. It is only possible to make an update on a screen that is online. This is seen by this small circle which appears on the right side of the screen.
If a new update is available for the screen, a small update icon will appear.