The best way to e-file your 2018 return, since you are having this issue, would be to download your tax file and the Turbotax 2018 Desktop Software. Please see this Turbotax FAQ for more information, https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return-in-the-turbotax-cd-download...
Here is the 2018 Amend Software for Windows, https://turbotax.intuit.com/personal-taxes/cd-download/amend/ty18/
Here is how you get the 2018 Amend Software for Mac, https://ttlc.intuit.com/community/amending/help/how-to-amend-change-or-correct-a-return-you-already-...
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