Yes, you can uninstall your previous years TurboTax software. If you have purchase your software directly from TurboTax, then you would still be able to download your software for up to three years past the year of the software, by signing into MyTurboTax.com.
Save all *.tax20YY files and it would be a good idea to make pdf copies of your past returns just in case you need them to amend or IRS inquiry or audit. Many people at least 3 years saved for that purpose.
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