Can't update Firmware from 4 to latest on Mac OS BigSur 11.4

I believe I am following the instructions correctly…but when I launch the Kordbot Updater app and select the .dfu file (though the extension is .upf …kordbot_20211201.upf)
The terminal launches and says>

dyld: Library not loaded: /usr/local/opt/libusb/lib/libusb-1.0.0.dylib
Referenced from: /private/var/folders/y0/fy1qz8w135107v4ybhp8btzh0000gp/T/AppTranslocation/15016E61-B698-4618-B3BC-2CAA1A225CB0/d/KordbotUpdater.app/Contents/Resources/dfu-util
Reason: image not found

Any help MUCH appreciated!