Allow me to help share some information about exporting QuickBooks Online data file to be able to import to Quicken.
To get started, to export QBO data file, you can follow the steps provided by my colleague RenjolynC.
Keep in mind that Quicken cannot import Excel (.xls), CSV, QuickBooks, PDF, or OFX files. Quicken allows you to import data from selected financial institutions, applications, and other versions of Quicken. With this being said, you'll need to convert your QBO data file to the file format accepted by Quicken. Once done, you can now import your data to Quicken.