After clicking on a shared link or a link from an email notification, a Smart Banner will appear giving the option to View or Open.* Do not click the “X” next to the app icon, as that will deactivate the banner permanently.
Tap View to launch the App Store and download the app.
Tap Open if you already have the app, and you will be brought directly to that piece of content.
*Smart Banners work for iOS 7.1+.