Author Topic: Installing macOS or OS X: What to do when ‘the installer payload failed signature check’ or ‘this copy of the install OS X application cannot be verified’  (Read 62 times)

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Offline Gilbert

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Installing macOS or OS X: What to do when ‘the installer payload failed signature check’ or ‘this copy of the install OS X application cannot be verified’
31 May 2017, 9:01 am



The other day a co-worker needed to borrow a Mac, so I grabbed an older MacBook Air from storage. I decided to wipe out the laptop’s flash storage and install a fresh version of OS X. I created a bootable USB flash drive installer, plugged it into the laptop, pressed the Option key as the machine booted, and then selected the USB drive as the boot disk.

I then ran Disk Utility to reformat the drive and then ran the installer to install OS X. It looked like things were moving along, until this appeared on the screen.

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Source: Macworld OS X

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