You will need to sign in to each year.
https://turbotax.intuit.ca/tax-software/prior-year-taxes.jsp#2017
Go to the "File" tab and hit "continue" until you see the print page that I am attaching.
Click on "Download a PDF copy of My federal return"
Do this for each year.
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.