22 Replies
      Latest reply on Apr 11, 2017 8:48 AM by Makotona
      surjoonpark Level 1 Level 1 (0 points)

        I have mid 2011 Mac mini and a USB external HDD. I tried to install the 10.12 beta on it.
        However, it complains with this message, "The installer payload failed signature check"


        What's that message and why does it fail?