The manual update suggested by CatinaT1 will not delete or change your tax return/information. While it does uninstall and reinstall the TurboTax software, the update utility will ensure that you have the latest version of TurboTax Desktop.
It might be helpful if you provided a screenshot of the error messages you are seeing with regards to Special Depreciation. Some issues have been resolved but others have cropped up after the last update.
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