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Help Cannot install apps anymore

Before I could install apps outside the play store but all of a sudden when I tap install it dosent do anything (cancle works) see photo attached. PS I have enables my phone to install apps from unknown sources.
 

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Before I could install apps outside the play store but all of a sudden when I tap install it dosent do anything (cancle works) see photo attached. PS I have enables my phone to install apps from unknown sources.


Could you kindly share with us what kind of app is that?
Some system apps ported from other devices, like 4.2.2 lock screens etc, use their own, specific permissions unavailable in the Galaxy S3.
It could also be, that the app is simply not supported by your device.

Is that app available through play store? Maybe we could try and see whether it's your device only, or generic problem.
 
It happens to any app now. Even apps that I installed before I unstalled them do not work. And yes most of them are available tgrough play store
 
It happens to any app now. Even apps that I installed before I unstalled them do not work. And yes most of them are available tgrough play store


Try clearing the Package Installer Cache.

Go to Settings - Application Manage - All - Package Installer, clear the Cache - Force stop it and reboot your device.

If still no go, try to clear the Partition cache by booting the phone in recovery mode. Turn off your phone and wait for a while. Then press and hold the Volume Up + Home + Power Button, and wait for the device to boot up. You can navigate through the menu using volume key, and make selection using the Power button. One of the options is "Clear Cache Partition".

If after this you are still unable to install the app, try to use 3rd party installers.


And if non of the above worked, factory reset? Some system file could get corrupted and you might need to restore the phone.
 
Have you disabled anything in Settings, Application Manager? (Disabled apps will be at the bottom of the list when you scroll across to ALL)
 
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