Get your taxes done using TurboTax

...It's not clear to me that download is available  with a normal CD pre-order . on the single-purchase page.

Yes...they have historically included a download copy if you order the CD thru TTX Advantage.  That program does an auto-order (and auto-charge) every year ...but (opinion) that's mostly for type A people who have to have it Right Now, not realizing the software is extremely buggy until late January or Feb anyhow  (more opinion).
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*