Nokia’s Settings apps are updated very often, but their links can not be searched for directly in the Windows Phone Store.
Nokia Pusher is an app which caches all these links so users can manually update their Settings apps as soon as they hear a new version has been released, rather than waiting for the update prompt to show.
The app supports the 520, 620, 720, 820, 920 with new devices being added as they arrive.
The app is free and can be found in the Windows Phone Store here.
Thanks Mohamed for the tip.