Sorry you can not use a Mac. The Turbo Tax Business program is only available for Windows, not for Mac and not Online. And you can’t upgrade from a personal version like Deluxe to Business. Turbo Tax Business and Turbo Tax Home & Business are not the same. Home & Business is for personal 1040 returns that need Schedule C for self employment income.
If you already bought the separate Business Windows program ask for a refund. Or maybe find a Windows computer you can install it on. How to contact Turbo Tax
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-contact-turbotax/00/26991
