Yes you can buy it using your account. Or from anywhere.
You need to buy Turbo Tax Business, not to be confused with the personal Home & Business version. TT Business is not available to do online or on a Mac. You can buy the Windows Desktop program here,
https://turbotax.intuit.com/small-business-taxes
Window System Requirements
https://ttlc.intuit.com/community/system-requirements/help/minimum-system-requirements-for-turbotax-...
