You must use the TTax version for the specific tax year you want to file.
You can purchase CD (or Download) from TTax at this link:
https://turbotax.intuit.com/personal-taxes/?view=desktop
Please be aware that the screen graphics display make it somewhat confusing
regarding Windows or MAC and whether you want a CD or download.
Please read carefully; the choice to order a CD is shown in much smaller
letters.
Check reputable local big-box stores or their on-line equivalents
.
They generally charge less than TTax charges for direct
purchases.