I found the answers to my questions:
1. To see Tax Tools, I needed to actually begin working on my return by clicking on one of the online TurboTax questions rather that just starting TurboTax. At that point, the Tax Tools appeared in the left side menu. So I did not have to use the CD/download version.
2.By clicking Tax Tools, and then Tax and then Save your tax return, I was able to download my partially completed .tax2021. So downloading a partial return with online TurboTax is definitely doable. And I expect I can use this to continue my return with the CD/download version.
