How do I upgrade or switch to a higher version of TurboTax Online?
You can upgrade or switch to a higher version of TurboTax after you've started your 2018 return. If you used Free Edition and need to access prior year tax returns you’ve filed in TurboTax, you can do that by adding PLUS to your 2018 account.
To upgrade your version of TurboTax:
Make sure you’re signed in to TurboTax and are in your return.