Unable to Download App
This probably means that the application you tried to download is not currently compatible with the iOS version running on your device. Retry once. If it does not work when you retry, unfortunately, you will not be able to install the application.
Untrusted Enterprise Developer
This message means that the developer of the application that you've tried to download is untrusted by Apple. In order to use the application: Settings>General>Profiles>Choose Profile>“Trust [Developer Name]”>Reopen Application
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