Why an update badge won't go away on an iOS app

iOS tries to prevent you from installing apps on your iPad and iPhone that won’t run, but sometimes you’re left with cruft—digital vestiges of the past—that persist and make things difficult for you to sort out what’s wrong.That appears to have happened to Macworld reader Carol, who has an app called Life Cycle installed on her iPad. The update badge is on her App Store icon, but whenever she tries to install the update, she’s told it’s not compatible w