Always save PDF copies of your tax returns, and even an additional copy offline, should your computer fail to work. While older years can no longer be opened by the TurboTax app, there is a web-based service where you email them your tax file, and they will email back a PDF. They are not affiliated with TurboTax. You would have to assess the risks if you decided to use this service
https://www.taxprinter.com/
however, I agree with your complaint about no warning of the 4-year life span.
