What does app not installed mean? When I try to install an update on angrybirds epic rpg,it says "app not installed" what does that mean?It takes up 105.9 mb I have 500 mb left on my device.I have an android tablet.
It can mean many reasons, maybe out of memory, incompatible app, problems to your ROM, conflicting currently installed apps and etc.

Maybe you can try booting your phone to safe mode to remove conflicting apps . You can also try rebooting your phone.

Hope this may help!