If you ever need to amend a tax return for a prior year you will need that year's TurboTax software for the amended return.
You cannot use the TurboTax 2018 software to amend a 2013 tax return. Only the 2013 software can be used.
It is to late to file a 2013 amended return for a tax refund. There is a three year statute of limitations to file for a refund. For 2013 the return for a refund had to be filed on or before April 15, 2017.
