It is likely due to different system compatibility. Try reinstalling the program.
If you need to download your program…..
https://ttlc.intuit.com/questions/1901289-download-your-turbotax-software-purchase
Access your downloads here
https://shop.turbotax.intuit.com/commerce/account/secure/login.jsp?pagecontext=download
After you get the program reinstalled the first thing to do before you open your tax return is to update the program and install any state programs you had. Then open your file. So you first might need to start a fake return to be able to download the state program.
Do you still have the tax data file ending in .tax2015? Search your computer for it. That's what you need to open in the program. Or if you have the 2014 tax file (.tax2014) you can start a new return and transfer again. And in Windows be sure to manually save often. The Windows Turbo Tax doesn't automatically save. So go to FILE - SAVE or SAVE AS frequently as you enter data.
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