How can I updat macOS Sierra 10.12.6 to High Sierra 10.13 (MacBook Air early 2015)?
I get the following message:
"This copy of the software install macOS High Sierra.app is damaged and cannot be used to install macOS."
Earlier Mac models
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
If you’re short of bandwidth or data…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 Restart & a new copy more recent version can be downloaded.
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, there are 2 cures...
If you’re short of bandwidth or data…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 Restart & a new copy more recent version can be downloaded.
Trouble updating macOS Sierra 10.12.6 to High Sierra 10.13 (MacBook Air, early 2015)
