To complete and file prior year tax returns, 2016 thru 2018, you would need to purchase, download and install on a personal computer one of the desktop editions for each tax year needed from this website - https://turbotax.intuit.com/personal-taxes/past-years-products/
Prior year tax returns can only be printed and mailed, they cannot be e-filed. The TurboTax desktop editions for the prior years all have the same forms, schedules and worksheets so Schedule C-EZ is included. When mailing multiple tax years use a separate envelope for each year.
Only the 2019 tax return can be e-filed.
The TurboTax online editions for tax year can be used for tax year 2019, but you would need at a minimum the Deluxe editon to report the self-employment income if NOT entering any business expenses. Otherwise you would need the Self-Employed online edition to report self-employed income and expenses on a Schedule C. The Schedule C-EZ is not longer used beginning in tax year 2019 - https://turbotax.intuit.com/personal-taxes/online/
Any of the TurboTax desktop CD/Download editions for 2019 can be used to report self-employment income and expenses. However, the Home & Business edition is recommended - https://turbotax.intuit.com/personal-taxes/cd-download/
