Unfortunately, the licensing on Amazon makes it necessary that this requires an Internet connection!
Say, especially abroad, where roaming is now not necessarily like activated roaming is necessary so that the Amazon App Store can check its license. Strangely, this is not the case with purchased programs on Google Play.
In addition, all apps installed via Amazon basically want Internet, memory and system ID permissions on the normal requested rights also. Clearly visible is something with XPrivacy.
Greetings from the collectors of free apps ...