First you should ALWAYS save a PDF of the finished return AND the .taxfiles to a removable storage medium so you can access the return anytime. If you did not save the PDF then you may no longer be able to open the 2017 or 2018 .taxfiles because you may not be able to get updates or state programming for tax years that old.
Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
If you are an Advantage subscriber sign onto your Advantage account to download
https://accounts-tax.intuit.com/turbotaxadvantage
