I had a problem with WAZE updating on an iPhone 5. I power cycled the phone. It did not help. I was able to go to the applications list and remove the app. Now I wanted to reinstall it. If I look it up in the app store, it says installing. I tap on it. It takes me to the home screen, but there is no icon for it. If I go to app store and updates, it is not listed. I've tried different wifi networks. I've tried over the data connection. I've restarted the phone between each of these attempts. I've signed out of the app store. Rebooted and signed back in. I've connected to a PC with iTunes.
It's just stuck. It's like the app store thinks it's installing. But it's not. It's not far enough in the process to put an icon on the screens. It's also not far enough that shows installed and available for updating.