Audacity won't be able to see all of the Focusrite's I/O in a Windows environment due to the limits in Windows audio drivers. The only way to be able to make use of all I/O is to use the Focusrite supplied ASIO drivers which bypass the OS completely. However, as you have found, Audacity isn't licensed to use ASIO drivers, although I believe that there are ways of making them work. So for Audacity and other Windows A/V apps you are stuck with basic stereo I/O. WASAPI drivers may allow up to eight channels of I/O.