Get your taxes done using TurboTax

Sounds like you are on the Advantage Plan?  If you are on the Advantage Auto renewal program you get both the Windows and Mac Downloads.  Check the Email, scroll down and there is a part that looks like an invoice, it should say
TURBOTAX ADVANTAGE TY2018 CD W/WIN
AND MAC DOWNLOAD

If you need to download your program…..
https://ttlc.intuit.com/questions/1901289-download-your-turbotax-software-purchase

Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download

If you can't find it,  you might have more than 1 account.  Use this TurboTax account recovery website to get a list of user ID's for an email address.  Run the tool against any email addresses you may have used https://myturbotax.intuit.com/account-recovery