Installing TurboTax 2021 deleted the.tax2020 file (?)

Today, I installed TurboTax Deluxe 2021 on my Windows 10 PC.  I did last year's (2020) return on the same PC using TurboTax.  After installation,  TurboTax could not find the .tax2020 file from last year's return.  Indeed, the Documents/TurboTax folder is now empty.  I tried the recommended things like checking the Recyle Bin, checking One Drive, logging in as admin, restoring the PC as it was prior to installing Turbo Tax 2021 ---  but to no avail.  Are others experiencing the same issue?  Is there a solution? Thanks!