Alldevice app updates are automatically checked when you log in to the app, but no more frequently than once every 24 hours.
If you want to check for updates manually, select System > Check for updates from the top toolbar.
After the check, a pop-up window will be displayed informing you if there are no updates available or if an update is available and giving you the option to read the version information or update the application immediately.
Version information can be found HERE