Also remember that, for iOS or iPadOS, to disable auto updates of the ASIAIR App, Apple only let's you disable auto update for all apps. Apple doesn't let you disable auto update for individual apps.
However, I think this is right, if you install the app from TestFlight then that App doesn't auto update (not sure if that's a setting you have to enable or something, though).
On Android:
you can install any version any time you like for however long you want (there's a thread here https://bbs.zwoastro.com/d/18885-how-to-downgraderollback-asiair-app-firmware-with-android).
You can also turn off auto update for just the ASIAIR App on Android.