Android App not compatible with devices that sideload Google Play

Question

I have an app which has been deployed to Play and is compatible with any device running 2.1 or later; no special restrictions or requirements defined in AndroidManifest.xml.

Answer 1

Maybe the affected users can try and reset the Google Play Store app on their devices:

Menu --> Settings --> Apps --> Google Play Store

Then click "Force close" and "Clear data"

Then start Google Play Store again, login, and try to install your app again.