.tax2021 file will not open

After working on my taxes for 2 days 3/25 and 3/26 I came back to finish 4/15 and it will not open the .tax2021 file. I am using a windows 10 PC that was updated 3 days ago and Turbo Tax Home & Business also updates to the newest version today. I am able to open 2 other .tax2021 file I had worked on for my kids. They both show in the Continue your 2021 tax return window while my return file does not.