If you have 2018 TurboTax already installed on your computer, open the program and select "check for updates" from the Online menu across the top.
Once the program has updated, close the program and re-start it to apply updates.
If you filed online, you can access the software to download here: TurboTax 2018 products.
Here are some additional instructions on how to complete the amendment as well: How to amend a return in TurboTax
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