Is it possible to obtain the Turbo Tax software that was in use for tax years 2012, 2013, and 2014.  For those years, I was using Tax Slayer and missed the $20,000 pension exclusion for New York state.  I noticed the omission when I filed 2018 taxes using both Tax Slayer, and Turbo Tax software.  New York state has denied my amended returns because of  a 3 year statute of limitations.  I am appealing the ruling based on the theory that New York state did not require the use of "standard practice" across multiple tax prep software providers, in that the pension exclusion was automatically populated by the Turbo Tax software based on the standard questions asked.  Upon contacting Tax Slayer when I noticed the omission, I was told it was a "voluntary entry", which was buried in their software.  I'm anticipating that during my appeal, I may be asked if using Turbo Tax software for the years in question would have automatically populated the exclusion subtraction as it did for my 2018 and 2019 taxes.  If necessary, if you have questions about my problem, it may be easier to explain verbally.  Thank you.