Allow Installation on Android
To install app stores or external apps that are not initially available on your Android device, Android requires a security setting to be toggled.
Once toggled, this enables you to download apps from sources, other than Google to your device.
To allow install:
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From the menu button on your home screen navigate to "Settings."
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Select "Security".
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Check the "Unknown Sources" box (you may need to scroll down to see these settings).