Generally, the IRS can only audit you for 3 years after the date you filed, but sometimes they have 6 years. When did you actually file your 2012 return? (If that is not a typo).
Turbotax is not supported that far back, the program probably won't run on a more recent operating system and Turbotax does not support the updates that would be needed to the CD version, which was released before the forms were final (that's why updated are needed.)
You may want to seek professional advice as to whether you owe anything, based on the statute of limitations. If you decide you do owe, you can just pay the assessed tax and the IRS will adjust your file. Or, if you have losses to report, that might reduce the tax you owe, but you would need to see a professional or do your amended return by hand.
