I need to do my taxes for 2015 and 2016 before I can do my 2017 taxes.

[DoninGA · Accepted solution]

Go to this website to purchase a download of each tax year's desktop editions - https://turbotax.intuit.com/personal-taxes/past-years-products/

Prior year tax returns can only be printed and mailed, they cannot be e-filed.

When mailing multiple tax years use a separate envelope for each tax year.