How to Install Apps from Unknown Sources in Android 
 http://basictutorial.net/how-to-install-apps-from-unknown-sources-in-android.html 
 One of these security features on your Android device is that you are not allowed to install apps from outside the official Play Store on your device. That means even if you have the application file in the format of APK, you will not be able to install it on your device — unless you have s…

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