How do I download all of my files from here in QB-for all the years I've had QB onine?

Welcome to the Community, @laassociates.

You can consider exporting all of your data in QuickBooks to MS Excel and save it somewhere on your computer or to your flash drive. This way, you'll have a copy of your files. Let me guide you through the steps.

1. In your QuickBooks Online account, click the Gear icon and select Export Data.
2. In the Reports tab, select the date you want to export.
3. Toggle each report, then click the Export to Excel button.
4. Then, go to the Lists tab and toggle Customers, Employees, and Vendors.
5. Click Export to Excel.

Once done, you can save the file on your computer or a flash drive.

Here's an article you can read for more details: Export Data out of QuickBooks Online.

As always, feel free to visit our QuickBooks Community help website if you need tips and related articles in the future.

Please let me know if you need clarification about this, or there's anything else I can do for you. I'll be standing by for your response. Have a great day and be safe.

@laassociates 

Utilize the 3rd party exporter tool

https://transactionpro.grsm.io/qbo