If you find that you are unable to download apps from your installed App store, we suggest that you clear the data for the App store.

Tap the Apps menu in the bottom left corner of the home screen.
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Tap the Settings icon in the bottom left corner, and then select the Settings app.
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Select Apps and then swipe to the left to show All.
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Select the App store you are using from the list.
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Tap FORCE STOP and OK.
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Select Storage.
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Tap CLEAR DATA and OK.
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Launch the App store and attempt to download the app again.