I need to prepare 2017 taxes

[DoninGA]

if you choose to use TurboTax to complete and file a 2017 tax return then you will need to purchase, download and install on a personal computer one of the 2017 desktop editions from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/

A 2017 tax return can only be printed and mailed, it cannot be e-filed.

[stephenjdavis2017]

Do I need to purchase TurboTax again to prepare taxes for prior year?

[DoninGA]

Each tax year is a separate TurboTax program.