But did you actually update the firmware in hardware manager, that is what it was telling you to do, not the driver. Hardware manager is a program that comes in the MyDMx 2.1 folder so you can check hardware firmware etc.
Go too C:\MyDMX2.1\HardwareManager make sure myDMX 2.1 is not running or even open, and launch hardware manager, follow the prompts for firmware.