Two people report now this problem, while this works fine at our lab. So I'm puzzled right now.
I attach two screenshots from the device manager and the Command Line interface. Can you compare it with what you see? Which is the firmware version of your evaluaiton board?
I cannot find the EVAL board using drscl version 5.06 while the drsosc works fine. I tried 2 different eval boards and 2 different computers and the same effect. I looked under device manager at the libusb and the drs4 was there, and checked the driver which was found to be up to date.