After you file

You must have the 2015 program to open the 2015 .taxfile  so you can save it as a PDF ... Always save the return as a PDF with and without the worksheets right after it is accepted by the state and IRS so you don't run into this issue later. 

Contact TurboTax support and speak directly with a TurboTax support agent concerning this situation.

See this TurboTax support FAQ for a contact link and hours of operation -https://ttlc.intuit.com/questions/1899263-what-is-the-turbotax-phone-number