TurboTax Home and Business (which prepares Form 1040 and associated schedules) and TurboTax Business (which prepares 1065, 1120, 1120S, and 1041) are completely independent programs. It is not possible to upgrade to one from the other.
If TurboTax Business is the program that you need, you can find it available to download here: TurboTax Business Download.
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