To amend your 2016 tax return, you will need to open your TurboTax 2016 software. Updating 2017 does not remove your 2016 TurboTax, it only update the 2017.
Follow these instructions to amend and Open the return you want to amend in your TurboTax software program: https://ttlc.intuit.com/replies/5114143
