You can download Cash app on your smartphone via Play Store or App Store. After installing it, you have to create an account to use its services and make online payment. If you are seeing that the Cash app cracks suddenly while you're making a payment. In this scenario, you have to ensure that you are not working on an outdated version. If yes, then update it as soon as possible with the latest version. If you still facing the same, then talk to Cash App customer service to get an instant solution.