Reason: It is installed as a system app, and it's actually the UK (United Kingdom) version of the app that gets you out if you the exact Android app name looks [com.amazon.uk, .. ....]
It is the abbreviation UK behalf, when applying the app but you can tell that not everything is automatically set to German.
Where is therefore the problem ???
When trying to update or install a newer version the app is always loads automatically, the German version of the app, install the not fail because there is a similar app already as a system app (the UK version) has the same signature but it is indeed the same app is!
The system therefore refuses to install the app and the original installed app can not uninstall, since it is integrated as a system app.
SOLUTION !!!! :
Copies following link into the address bar of your smartphone browser:
http://www.amazon.co.uk/androidapp
Then you can download the latest version of the UK version of the app and install via the integrated into the system version.
Of course, in the system settings must be set before the hook to install unknown Apps (which do not come from Google Play Goals)
But that is anyway necessary to even apps from the Amazon Appstore to install.
