If you are able to obtain a copy of 2014 TurboTax for Windows and it does not automatically update, you can manually update: 2014 Manual Update (R45)
You likely will not be able to obtain any 2014 state modules for TurboTax. Without the corresponding state module(s) installed, it's likely that you will not be able to open your 2014 TurboTax tax file if your tax file includes a state tax return.
For an amendment that affects only a small number of forms, it would likely be far easier to amend manually using forms downloaded from the IRS.
