Welcome to the Community, @tbaxter.
I'd be glad to route you in the right direction when moving your data to Desktop. Please know that converting your Online data to Desktop will also require setting up your security settings in Internet Explorer. This way, the import process will run smoothly.
Also, there are things to keep in mind before doing this process. You can check this article for more details: Limitations when you convert from QuickBooks Online to QuickBooks Desktop.
If you're ready, you can follow the outlined steps in this article link: Export and convert your QuickBooks Online data to QuickBooks Desktop.
Let me know if you have other questions about the process. I'm here to help. Have a nice day!