Only the TurboTax software for the tax year of the amended return can be used. So if you need to amend a 2017 tax return, the TurboTax desktop software for 2017 has to be used.
If you completed the 2017 return using the online editions then see this TurboTax support FAQ for amending the tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-turbotax-online-return/01/27371
If you completed the 2017 return using the desktop CD/Download editions then see this TurboTax spport FAQ or amending the tax return - https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return-in-the-turbotax-cd-download...
