why are you trying to install 2011? the problem you face is that it's probably a beta version and updates are no longer available. so you will be using software that might produce an inaccurate return. if you were to open an old .tax2011 file produce with up-to-date 2011 software the results would likely be different and certain forms would either not be available or not up-to-date for filing. if you are trying to prepare 2011 because you are due a refund, forget it you are too late. if you owe, you may need to see a pro who maintain old software.
