For Audi App Store you should use OCU with software from 0595, a MIB3 TOP High with at least 4026 on it and update gateway to latest version, I don't know which other things are involved, I think it's a coding and Audi Connect licenses thing, which cannot be done by us.Exactly as Nirvananils wrote… a lot of people just see a new version and start to flash. I flashed a lot at my own car. Basically close to non ECU is untouched. But my car is MLBevo. The B9.5 is something between MLBevo and MLBevo Gen2. However also with SFD and SFD2 it becomes more and more difficult to understand what will happen with flashing.
For the AppStore i think you need an additional part. This will not work with older units. But maybe i‘m wrong and everything is easy peasy.
I don't know if someone of you has more info about it.