If you are on the Advantage Auto renewal program and ordered the CD you will also get both the Windows and Mac Downloads. So you don't have to wait for the CD or if you don't have a CD drive or if you need to install it again.
To access your download, sign in to your TurboTax Advantage account and look for My Downloads.
https://turbotax.intuit.com/personal-taxes/cd-download/advantage
Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
