You can buy either the CD or you can download it.
https://turbotax.intuit.com/personal-taxes/cd-download/
Or do you want to use the Online web version? You can start an Online return here. But there are several big differences between the Desktop program and the Online version so if you used the CD program last year you may not like the Online version.
https://turbotax.intuit.com/personal-taxes/online/
