The TurboTax Business Edition for filing a Form 1065 for a partnership is a separate stand alone edition. You cannot upgrade to the Business Edition from one of the Personal editions of TurboTax.
Go to this TurboTax website for the Business Edition. The Business Edition can only be installed on a Windows based personal computer. It cannot be used to file a personal tax return, Form 1040 - https://turbotax.intuit.com/small-business-taxes/cd-download/
Note - There is also an online Business Edition - https://turbotax.intuit.com/personal-taxes/online/live/business-taxes/
