The TurboTax Business Edition is a separate program. You cannot upgrade from one of the personal desktop editions, such as Home & Business, to the Business Edition.
Go to this TurboTax website for the Business Edition - https://turbotax.intuit.com/small-business-taxes/cd-download/
The Business Edition can only be installed on a Windows based personal computer. The Edition cannot be used to complete a personal tax return, Form 1040.