This is for all you folks that keep old Mac OS installers around on USB
sticks etc. -
Yesterday I tried to install an older OS onto a laptop. No matter which
version I tried, the installer quit, saying it couldn't be validated.
It turns out that back in 2016 Apple updated the certificate for
installers so that those downloaded before Feb 14 2016 no longer work.
The very easy workaround is a terminal command using the utilities on
the installer to fool the computer into believing it is back in 2016
before the change.
Details can be found here:
https://www.macrumors.com/2016/03/03/older-os-x-installers-broken-by-certificate/
D.
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Posted by: Dan McCabe <danlist@bestmail.us>
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