I take it that you're referring to the mobile accessibility for QuickBooks Desktop. In this case, I'd like to share some information about it.
There is a mobile app for QuickBooks Desktop. However, this is only intended for uploading receipts and bill entries into your QuickBooks Pro/Premier Plus or Enterprise copy.
You can find out more about the Desktop mobile app here:
Though if you need more features and functionalities for a mobile access for QuickBooks Desktop, an app offer might be available in our Desktop App Store: https://desktop.apps.com/home.
If you've decided to buy QuickBooks Pro and need help installing it in the future, you can visit this article for instructions and guides: Install QuickBooks Desktop (guides for getting started are also available in the article).
Feel free to drop by if you have questions about the functions and features in QuickBooks Desktop Pro. I'm always ready and available to help.