A CD is not downloaded. If you purchased a CD from the TurboTax website it will be mailed to you.
https://turbotax.intuit.com/personal-taxes/cd-download/
If you purchased a Download on the TurboTax website then you have to sign onto your download account using the exact same User ID that you used to purchase the download software.
Sign onto your download account here - https://shopping.turbotax.intuit.com/unified/downloads?route=myaccounts&cgcview=downloads
