I can not download cash app

Do you Meet these requirements? If not, that could be why you cannot set up Apple Cash.

What you need

• Be at least 18 years old and live in the United States.
• Have a compatible device with the latest iOS, iPadOS, or watchOS.
• Set up two-factor authentication for your Apple ID. 
• Sign in to iCloud with the same Apple ID on any device that you want to use to send or receive money.
• Add an eligible debit card in the Wallet app, so you can send money.

For more information, please check here:

Set up Apple Cash - Apple Support