Explore this reference

https:// quickbooks.intuit.com/learn-support/en-us/help-article/import-export-data-files/export-convert-quickbooks-online-data-quickbooks/L0tKtLwhn_US_en_US?uid=l20pfi00

Then you can purchase the one time license for QBD 2021 or the annual subscription for QBD 2022.