I can help you keep the up working after you download if from the App Store.
To begin with, may I know if you have tried to power down and restart your mobile device? Then, install the app again afterward. This will help us know if there's something unexpected bug in the app or problem in the iOS device.
In addition, you may want to check the system requirements of the app to make sure it works smoothly. Here's an article where you can see the list: QuickBooks Online Access For Mobile Devices.
Just in case you're still getting the same result, I would recommend contacting our chat and phone support team. They can take a closer look at this to determine what's causing the issue and make sure that you're able to install the app. Here's how:
They're always open for chat and callback every Monday to Friday, from 6 AM to 6 PM Pacific Time. I'd also recommend checking out this article for more references about our mobile app: Compare Mobile App Features.
Please tell me how it goes and if you have other concerns while using the app. I'm always here to help you out more. Stay safe and healthy.
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