I'll ensure you're able to download the app, @Miles22. I'll also share a way around to help you access your account. 

In the case that the application you're looking for doesn't have an option to re-download, it may be no longer offered in the app store. However, since the QuickBooks Self-Employed (QBSE) app will be delisted after 4/24/2024, I recommend reaching out to our QuickBooks support to further help you download it. 

On the other hand, you can access your QBSE account via a web browser on your mobile device. 

Furthermore, you may want to switch to our QuickBooks Solopreneur product which has a similar feature to QBSE. This is also built for self-employed businesses and has basic accounting features like invoicing, banking, mileage, etc. For reference, feel free to check this article: Introduction to QuickBooks Solopreneur.

If there's anything you want to know about accessing your QuickBooks mobile app, please don't hesitate to leave a reply below. I'd be glad to provide a prompt response. Have a good day.