If you used the CD/download product last year, you would have had to save a copy to your computer. There is no copy saved to the secure online cloud like there is when you use TurboTax online version to complete your return.
If you have your last year's return saved as a tax data file on your computer, you can transfer that to the TurboTax Online version you will be using. You can find steps here for that https://ttlc.intuit.com/questions/1900883
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