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For you reference

https:// quickbooks.intuit.com/learn-support/en-us/import-or-export-data-files/export-and-convert-your-quickbooks-online-data-to-quickbooks/01/186187

You should be able to open the converted file on QB Desktop 2020 or later versions. You can still purchase a one time license of QB Desktop 2021 or 2020 at a lower price.