You have always been able to buy the Mac download. Unless you are asking about doing a separate Business return. Business returns for 1065 Partnership, 1120 S or C corp or 1041 Estate/Trust returns are only available for Windows.
**Turbo Tax Business is not available to do online or on a Mac. You can buy the Window's version here both the download and the CD. And you can have both TT Business and TT Home & Business (or any personal version) installed on your computer at the same time. https://turbotax.intuit.com/small-business-taxes
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