Yes, you need to since each year the tax laws change both at the federal and state level. If you try to file your return using only one year of software, the tax calculations will be incorrect and the IRS and/or your state will likely change your return to the correct year, or flat out reject it.
To get the previous years software you can click here: https://turbotax.intuit.com/personal-taxes/past-years-products/
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