Cannot download or update amazon apps to tab 2 tablet

[AC Question]

I have accepted apps from unknown sources to be able to download amazon apps.

From the day I set up my tablet I've had problems. After several resets, I found that if I downloaded amazon apps first, they down loaded fine. But once I downloaded from Google play, apps would download but not install.

Amazon updates will download, but not install. The cancel button works just fine, but install button is useless.

 

[dpham00]

You should only install the app from one source and update from the same source.