I don't know, maybe someone else has an idea why. Contact Customer Service 5am-9pm Pacific 7 days a week at
<a rel="nofollow" target="_blank" href="
https://support.turbotax.intuit.com/contact/">https://support.turbotax.intuit.com/contact/</a> You can probably run the Windows Business program on a Mac using a Windows Emulator like Parallels. But you would have to buy a copy of Windows to install in it. Google Windows on Mac to get articles on the various options
One of the other users posted this a couple years ago, There are 4 popular products you can use: Parallels, VMWare Fusion, Oracle VirtualBox, or CrossOver. The first 3 require you to also buy a copy of Windows. The first 2 cost $50-80, the third is free. CrossOver also costs about $50-$80 but does NOT require you to buy Windows.
