iOS. And app

As you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

Howboutjustgetonwithit Said:

“iOS. And app: I need to get ios14.5 or later for an app I have a iphone8 how do I get this???”

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Upgrade Using a Computer:

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:

Use my User Tip:  Update your iPhone Using a Computer - User Tip

Update your iPhone, iPad, or iPod touch - Apple Support

iPhone 8 is compatible with ios 15.5, you can upgrade it from setting -> System Update

But if you would like to downgrade its high risky taks