Error 102345 TurboTax Deluxe 2019 / Way to recover an unreadable *.tax2019 file?

I last worked on my return 7/15/2020 and saved the file and the ~file.  I have a few things to finish up on my return and when I attempt to open either file I get an error 102345.  The file opened up fine in July, now it doesn't.  Both the *.tax2019 files are about 10.5mb each.  Is there any way to recover my almost ready to submit file?  Did a TurboTax update make my file unreadable?  I am able to open my mother in laws return and a 2/2020 version of my return in TurboTax Deluxe 2019, but not the version from July 15.  Any ideas?

Thanks!

Ron