Advanced usb port monitor 6 of usb midi keyboard

I am trying to monitor the signal of a USB midi keyboard but the driver is not installed the keyboard is shown as an invalid USB device and I can’t start monitoring. I had tried the free version on catching data during the enumeration stage but failed. The monitor seems can start only after the USB device has been enumerated, or it is a limitation of this free version? But isn't it the purpose of advanced USB Port monitor 6 to show what are the raw data on the port even without driver ? Is there a way to monitor the data in the USB? Thanks for the help in advance.
