Thanks for the quick replies Ray. And thanks for a super high quality kit. I couldn’t be happier!
I had to restore Windows 7 to a previous day to get rid of Zadig USB drivers.
I then plugged the unit back in to a USB 2.0 port and got the same diver installation error but this time I opened the help link on the error message. Apparently Windows wasn’t set to automatically search for drivers. As soon as I checked that it found and installed the proper drivers and I was able to upgrade the firmware with no problem.