I too just lost all my past files when TurboTax REQUIRED that I install critical updates to open (I didn't want to do this so that my previous returns wouldn't be changed by anything new in the update). I couldn't find the returns in my recycle bin, but DID find them when I searched *.tax2018. The upgrade for some reason moved my original Turbotax directory to be a subdirectory of my Roxio directory (disk burning!). I simply moved the files back to the Documents/Turbotax directory and everything was there. I'm both annoyed and relieved.
