Hi, installing twice for me did the work... "Do note that you might have to install it twice for it to work, as the first install will just remove the existing driver. If it's installed, there should be a "SiLabsUSBDriver.kext" file in /Library/Extensions with a date created of June 16, 2017.". It's not wotking for you? I'm on macOS High Sierra 10.13.6