Did you use the Desktop program last year or the online version? You should always save the pdf when you are done and print a hard copy. If you can't install the 2018 program to open the .tax2018 file you can ask support for the download program or get a copy of your return from the IRS or try converting it to pdf files at Www.Taxprinter.Com
Contact Customer Service
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https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
