Big Business uses New Architecture to simplify updating. When you download and install an Update on the Mac, it automatically replaces the one you are running. For Windows, Uninstall the old and install the new. Then, when you start the newly installed Update it automatically opens your Data File.
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In earlier versions of Big Business when you downloaded and installed an Update you also needed to follow the prompts to open your Data File.
Updates to Big Business 11 and higher automatically open your Data File.