Turbo Tax Software is available only back to 2013. To file a 2012 tax return you will need to complete the return manually.
See the article below for guidance on completing a prior year tax return.
https://turbotax.intuit.com/tax-tools/tax-tips/General-Tax-Tips/How-To-Do-Your-Back-Income-Taxes/INF...See IRS website to obtain 2012 forms
https://www.irs.gov/forms-pubs
