Get your taxes done using TurboTax

I believe I have not used a CD since 2015 (since the purchase of a Mac)?  I may be wrong.  Is there a way to easily use a CD with a Mac?  Otherwise, I would not do or have done this.   In which case this was new to me last year.  

 

Also why the differentiation  between CD and online?   Think it would be more costly for a CD, in which case TTax should make the upgrade for using  a CD version?   Think CD version is less convenient and harder to utilize (with a newer computer) and thus less and less popular, thus not as viable an option.  Seems like a bait and switch.