Search through all of our Frequently Asked Questions over here.
We've had some issues with the Play Store outside of the US recently but are fixing this as soon as possible.
In the mean time for users outside of the US can download our app from here: Firebase Storage
It will be available in the Play Store soon.
Users in the US and UK can download the app from here: https://play.google.com/store/apps/details?id=com.verdictmma.verdict