I had to replace my computer this year. Fortunately I still have my old computer, so I kooked it up, start TurboTax2020, whic was able to open the tax2020 file (which was done BTW). I saved it again, copied over to my new machine. It is able to import the data from the new saved copy of the tax2020 file. Not sure why it failed before but it was very concerning. Thanks
