Even if you find the 2016 software on eBay, etc. you will not be able to update it, so you will not get accurate results. The 2016 software is no longer available nor is it supported by TurboTax. It is too late to get a refund for a 2016 tax return; but if you owe tax due for 2016 you still need to pay the IRS the tax and penalties and interest.
You can use the paper forms to prepare by hand and mail them in. Or maybe seek local paid tax help.
https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
PRIOR YEAR FORMS FROM IRS
2016
Form 1040 https://www.irs.gov/pub/irs-prior/f1040--2016.pdf
Form 1040 Instructions https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf
Form 1040A https://www.irs.gov/pub/irs-pdf/f1040a.pdf
Form 1040AInstructions https://www.irs.gov/pub/irs-prior/i1040a--2016.pdf
Form1040EZ https://www.irs.gov/pub/irs-prior/i1040gi--2016.pdf
Form 1040EZ Instructions https://www.irs.gov/pub/irs-pdf/i1040ez.pdf
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
