Big Business 9 no longer works on Windows 10. Big Business 9.10 released in September 2015 included updates to support the first release of Windows 10 only. Later releases of Windows 10 require Big Business 10. Now even if you are running the original 2015 release of Windows 10, Big Business 9 may no longer work. If you have Support for Big Business 9 please contact us for more information.