If you used the Desktop program then it is only saved on that computer. You need to find the pdf file or file ending in .tax2018 on your computer. Did you use Windows or Mac?
Do you still have the 2018 program installed? Open it and go up to File-Open and see if your 2018 return is listed.
The data file ends in .tax2018 and should be in Documents in a Turbo Tax subfolder. Search your computer for all files ending in .tax. And check the Recycle Bin. The PDF file should be saved there too. If you don't have the actual .tax2018 file you might the the temporary file you can use. It also ends in .tax2018 but starts with a Tilde ~ sign.
Find your Tax file in Windows
https://ttlc.intuit.com/community/tax-data-file/help/find-your-tax-data-file-tax-file-in-windows/00/...
You didn't happen to save it to Windows OneDrive, did you?
Also if you have multiple Windows user accounts, log into each one and do the search for the *.tax2018 data file from within each one and checking the Recycle Bin in each one.
oh, just saw you have a different computer? Did you make any backups?
