Okay, seems I found a workaround. Try to download the app from Amazon Underground again and try to install until the error popup appears. Switch to a file manager, e.g. ES File Explorer with root permissions and go toI have a problem which I'm not sure that directly connected to this ROM. I have a Mi note pro and was able to install apps from Amazon underground app. Now, the apps are downloaded but won't install although I have "install from other locations" setting on.
Does anyone know how to solve this?
Thanks.
/data/data/com.amazon.mShop.android/files
Look for an update-XX.apk and copy this apk somewhere else where you dont need root permission to access and install the APK from there. Maybe there is an easier solution, or it will be fixed with the next ROM release but as of now this seems to work for me.