iOS 15.7 or 16 is not downloading. Error messave

Kalay_ Said:

"iOS 15.7 or 16 is not downloading. Error messave: Error message when attempting to download either iOS 15.7 or 16. Unable to Download"

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Update Using a Computer:

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

then...

2. Proceed with the Update:

Go Here:  Update your iPhone Using a Computer - User Tip

Restart your iPhone, and try again.