Sorry Turbo Tax Business is only available for Windows, not Mac or online. Either find a Windows computer to install it on or ask for a refund.
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https://support.turbotax.intuit.com/contact/
What is the Turbo Tax phone number
https://ttlc.intuit.com/community/using-turbotax/help/what-is-the-turbotax-phone-number/00/25632
