To prepare your 2015
return using TurboTax you need the 2015 Desktop
tax software and the return must be mailed in. A prior year return cannot
be done online; the Online version is only to prepare the current year’s return.
You can go to the following website to purchase and download TurboTax’s 2015
desktop tax software.
Or, You can go to the IRS website to get Prior Year Federal Forms, Instructions & Publications to manually do your returns (enter your form number in the find box)
If you need to file a State return manually you can go to your State's website for prior year forms to manually fill out & mail.
You can also check a website like Amazon.com for prior year
TurboTax software, or search the internet