 <p>Make sure your <strong>iOS version</strong> is compatible with the app you are installing.</p> <p>I saw this issue happen when a user was installing an <strong>iOS 8</strong> only app on an <strong>iOS 7</strong> device.</p> <p>Also, if you tried to install the application on iOS 7 and it failed due to being an incompatible version and then you upgraded to iOS 8, you will need to do the following:</p> <ol> <li>Download iExplorer (<a href="http://www.macroplant.com/iexplorer/" rel="nofollow">http://www.macroplant.com/iexplorer/</a>)</li> <li>Plug your device</li> <li>Delete all the files in "Media > Downloads"</li> <li>Restart device</li> </ol> <p>There's an iOS bug where it leaves behind the bundle ID and it will fail silently not allowing you to install the app after you upgrade.</p>