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Zorglub Developers are pretty used to unsigned software. If you really want a signed version, and are willing to pay $8, you can get one from https://www.mac-usb-serial.com/. If you'd rather live with an unsigned driver, the instructions here worked for me: http://0xcf.com/2015/03/13/chinese-arduinos-with-ch340-ch341-serial-usb-chip-on-os-x-yosemite/