@htirs You say you "upgraded" --- do you really mean you updated your software? Then when you tried to open up your return, you started a new return instead? Sounds like instead of clicking "Open" a return you clicked to start a new return, and then transferred 2019 to a new return.
Try looking for the return you had already prepared again by using "Open" return.
https://ttlc.intuit.com/questions/1901659-find-your-tax-data-file-in-mac
https://ttlc.intuit.com/questions/1900721-find-your-tax-data-file-tax-file-in-windows
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