Yes, in the second behavior, I installed Mini from the regular app store location, and without trouble.
I expected that after the gold version was released, I'd be prompted for the update from the app store, same as I am for all my other apps. (Mini is the only app I beta.)
If you hadn't posted here that it was out, I'd have kept using the beta until it expired.
sadly the subscription link does not exist anymore.
Will there be new betas soon?
I would also be fun for me testing new versions of Opera Coast and Opera VPN with the current iOS beta 10.3 (14E5260b) and future versions.
This might help you because only some crazy girls like me run mostly pre-release apps in a pre-release OS on their main device.