The TurboTax desktop editions for tax year 2019 have Schedule 1, 2 and 3 included in the program.

Go to Forms mode by clicking on Forms.  In the upper left click on Open Form.  Type in schedule 1, schedule 2 or schedule 3.

Schedule 1 - Additional Income and Adjustments to Income

Schedule 2 - Additional Taxes

Schedule 3 - Additional Credits and Payments

Are you asking about the Desktop program download or downloading a pdf of your tax return?  What year?