This has been solved. I connected the Keylab to a powered USB 2 hub. Still had a problem. MCC found the device, but said it couldn't connect because it may be in use by something else. I read a thread somewhere discussing how Windows MIDI is easily hijacked, so I started disconnecting everything that was non-essential, and shutting down any processes that were audio-related. I had turned off the Keylab, uninstalled the driver, uninstalled the MIDI Control Center, and rebooted. I then installed the MIDI Control Center and turned on the Keylab. It connected to the device, so I ran the firmware update. After selecting the DAW in the MCC, I opened Pro Tools and it didn't find the device. I shut down Pro Tools, closed the MCC, then re-opened Pro Tools. It finally found the Keylab and is currently working.
Maybe this will help someone else. Hopefully they don't have to also jump through any flaming hoops or catch a bullet with their teeth.
Thank you, LBH. Your replies gave me just enough determination to push through this and figure it out. That made the difference. Cheers!