ADDENDUM:
If you already started a 2020 return in Online TurboTax and want to switch to 2020 desktop software, see this FAQ on how to download your *.tax2020 data file and continue it in the desktop product without having to start over.
FAQ: How do I switch from TurboTax Online to the TurboTax software?
https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-switch-from-turbotax-online-to-th...
