That's because you can not use the online version of the program to file prior year's taxes. You have to purchase the CD/Desktop version of the 2014 program, download it, then install it on your computer. Then you'll use it to complete and file your 2014 taxes. Note also that a prior year return can not be e-filed either. You have to print it, sign it, and mail it to the IRS. See https://turbotax.intuit.com/personal-taxes/past-years-products/ for TurboTax 2014.
