I think there is a problem with the latest beta version in the Playstore (1.0.27).
Unfortunately the Playstore only allows you to install the latest version, so I’m sure James will want to fix this soon. In the meantime, you can always download previous released versions from here https://github.com/mooshim/Mooshimeter-AndroidApp/releases. Release 26 is pretty stable and it has included FW 1466836533. Hopefully you know how to side install apps from unknown sources.