Ok .. if you have a MAC why did you download the WIN program ? Where did you get the program ?
It can handle the 2015 version : <a rel="nofollow" target="_blank" href="https://ttlc.intuit.com/replies/3299949">https://ttlc.intuit.com/replies/3299949</a>
You'll have to do this on a computer or laptop, as it involves installing the TurboTax download software. You won't be able to do this on a mobile device.