You can’t transfer returns from TurboTax Online to TurboTax CD/Download. TurboTax Online doesn't generate .ttxx files, as it's not based on the desktop software.
If you need a refund, this page has information on how to get one: https://turbotax.community.intuit.ca/turbotax-support/en-ca/help-article/taxation/get-refund-turbota...
