It won’t download the updates

Susiekay2 Said:

"It won’t download updates: Can’t get phone to do updates"

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For starters...

Updating an iPhone:

What to Update:

Update Installed Apps along with the iOS.

Determining if an iOS Update will Install:

How to do so...

I. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS15 then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

II. If Compatible...

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:

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

What happens when you try?

See if this article helps

If your iPhone, iPad or iPod touch won't update – Apple Support (UK)