The Desktop version of TurboTax software does not "auto save" the way online software does. When using the desktop software you have to go to File and Save your return. The program will prompt you to save when you exit, but there is not "autosave"
Recent versions of Turbotax create a temporary file when you open a tax return. Try looking in the Turbotax folder in your Documents folder for a .tax file that begins with a "~" character and then open that file.
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