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Online TurboTax is for 2019 returns only.
To prepare a 2018 return, you'd need to use the CD/download software. And it cannot be efiled. It has to be printed, signed, and mailed.
You can buy the 2018 software here:
https://turbotax.intuit.com/personal-taxes/past-years-products/
Did you already start a 2018 return online and need to download the *.tax2018 data file to finish in the software? If you already paid for 2018, TurboTax should furnish you the software to finish your started return, if applicable.
You may also need this information.
Minimum system requirements for Windows version:
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
Minimum system requirements for Mac version:
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