The 2017 software will only prepare a 2017 tax return. If you want to prepare a 2019 tax return, you have to use the 2019 desktop software, or you can use TurboTax Online.
If you want to prepare a 2018 tax return, here is the link to the 2018 desktop software - you can't use TurboTax Online or e-file a 2018 tax return. Online is only for the current year and e-filing is only available for the current year.
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