I've got a very similar problem with my KPA (also 6.0) and Rig Manager (2.1.76) on my PC (Windows 7, SP1).
I already opened an support ticket, but the instructions didn't help yet: The KPA ist recognized and the actual driver is installed, but the PC shows an error message (Code 52).
I deinstalled the driver and the rig manager and reinstalled both, but nothing changed.
best regards
Jo