SD Connect C4 “Internal Error: CSD DLL not found”

Can somebody help me? I bought the Mercedes-Benz SD Connect C4 diagnostic system. Then the first cat (real car) I hooked up to this is what came up.
internal-error-csd-dll-not-found

Solution shared by customer:

I fixed it.
Updated firmware in MB SD C4 interface and new key.

How to update MB SD Connect C4 firmware?
http://www.mbstartool.com/upload/service/second-step-update-sd-connect.pdf