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I can't install or update my operating system. In trying to update to High Sierra I get an error message that says "this copy of the install macOS High Sierra application is damaged and can't be used to install macOS." So how do I update to the new OS?
iMac 21.5″, macOS 10.12
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS High Sierra.app in Applications then a new copy can be downloaded.
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS High Sierra App in Applications, so expired Certificates are not expired.
Or... trash the Install MacsOS High Sierra.app in Applications then a new copy can be downloaded.
Thanks for the tip!
Great news I could help, take care my friend. :)
High sierra install application damaged
