Thank you for advice. I had a had time using mkII with Studio 4, after installing Studio 6 first. Probably usb driver gets updated to version 11.00 in Studio 6, and I thought this is the reason Studio 4 can not recognize mkII on usb port.
When you say it worked, does it mean that it compiled and loaded the image and quit, or that you were able to start debug session on the target?