if you didn't save a pdf version of your 2017 return, the program is no longer supported and thus the file cannot be opened to print schedule C. there is a webservice where you can send the xxx.tax2017 file to convert it to a pdf and email you a copy
here's the site. it's not affiliated with Turbotax. we do not vouch for it.
https://www.taxprinter.com/
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