If you used a downloaded version on your computer then only you have a copy of the return ... open the program and search for any files ending in .tax2018 then once you can open the return you can save a copy as a printable PDF.
Save a Backup Copy of Your Tax File
To save a backup copy of your tax data file (.tax file) that can be opened and read by TurboTax CD/Download software, you'll need to choose your TurboTax product:
Similar-sounding—but very different—is saving a copy of your tax return as a PDF file, which is like a picture or "snapshot" of your tax return that you can view or print.
PDF files cannot be opened or read by TurboTax software, which means they cannot be used for amending or troubleshooting calculation issues.
Related Information:
Why should I save a PDF copy of my return?
Saving a copy of your return as a PDF (in addition to the proprietary tax data format TurboTax uses) lets you open, view, and print your return using the free Adobe Reader or Foxit Reader software.
This is a lifesaver if your tax data file gets corrupted or if you no longer have the TurboTax software to open it in. The government also accepts a paper-filed return printed from the PDF.
Please note that TurboTax PDF files cannot be "read" by the TurboTax software the way the tax data file can, which means they cannot be used for amending, troubleshooting calculation issues, or for full prior-year transfer capabilities.
For specific instructions, refer to the Related Information section, below.
Related Information:
https://ttlc.intuit.com/questions/1900937-why-should-i-save-a-pdf-copy-of-my-return
How can I protect the tax files on my computer?
Protect the sensitive information in your tax data files and tax-related PDF files with the following (the more, the merrier):
Another option is to move your tax and tax-related PDF files off your computer and onto a storage device which you can then store in a secure location.
Related Information:
Download your 2018 tax return from Print Center to include all forms, schedules and worksheets -
When you sign onto your online account and land on the Tax Home web page, scroll down and click on Add a state.
This will take you back to the 2018 online tax return.