I am unable to download apps

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If you can’t download or update apps on your iPhone or iPad – Apple Support

If you are experiencing difficulties with adding or removing Apps to/from your iPad, you need to check your ScreenTime restrictions:

• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Adding Apps - ensure that this permission is set to Allow
• Settings > Screen Time > Content & Privacy Restrictions > iTunes & App Store Purchases > Deleting Apps - ensure that this permission is set to Allow

Did you setup a payment method for all of the Apple online stores in the Settings app, tap your large Apple ID panel at the top, tap the Payments & Shipping panel, then add a method of payment to be able to use all of Apple's online stores?

What happens when you try?

If there is an error message, what is the exact

complete text of that error message?

You need to provide more information before someone may offer a solution.

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Writing an effective Apple Support Communities question:

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