I have included two links below - one is to the general page to purchase the downloads and the second link is directly to the Premier version (it shows you are asking from online Premier) if that is want you want. Click the Buy Now tab and follow the on screen instructions to purchase and install the download.
https://turbotax.intuit.com/personal-taxes/cd-download/
https://turbotax.intuit.com/personal-taxes/cd-download/premier.jsp
