Mac OS X
Q: A problem while clean-installing macOS Sierra!
Hello.
I've been trying to perform a clean installation of macOS Sierra on my MacBook Pro (15-inch, Mid 2010), but every time I do that, I get a message (just during the last minute of the preparation for installation) saying, 'The installer payload failed signature check.' Would anyone please tell me what that means and how to resolve the problem? I'd appreciate it!
Incidentally, I previously clean-installed previous OS X versions on my MacBook Pro and all the installations went smoothly and without issues. macOS Sierra itself successfully clean-installed on my iMac (27-inch, Mid 2011)!
MacBook Pro, OS X El Capitan (10.11.6), (15-inch, Mid 2010)
Posted on Sep 26, 2016 11:31 PM