Each year's version of TurboTax is unique. To be able to open the last 8 years of TurboTax tax files you'll need to install the TurboTax version for each of those years. However, installing the state versions and the latest updates for versions more than three years old might be problematic.
If the state version cannot be installed, TurboTax will not be able to open a tax file that contains a tax return for that state. Because of this, for each year I always save a copy of my tax file with the state return removed.
