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How can I upgrade from El Capitan to Sierra so that I can install updates on a few legacy applications that won't work beyond macOS 10.12? I have found links to the download page on this site as recent as September, but when I attempt to download the file nothing happens. See https://support.apple.com/en-us/HT208202
Mac Pro, OS X 10.11
Hmmm, maybe caches are remembering bad stuff, but...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS Sierra App in Applications, so expired Certificates are not expired.
Hmmm, maybe caches are remembering bad stuff, but...
Disconnect from the Internet & set the Date back to 2014, then you can run the Install MacsOS Sierra App in Applications, so expired Certificates are not expired.
Thanks, but I had already unsuccessfully tried that route (using Chrome). This message appears in the popup window when I attempt a download:
"This copy of the Install macOS Sierra application is damaged, and can't be used to install macOS."
AHA...
If you get a corrupted message...
Naw, not damaged, it's just that you have an old copy already in Applications, Trash the Install MacsOS High Sierra.app in Applications then a new copy more recent version can be downloaded.
Thanks again, but I removed the old Sierra upgrade copy from the Applications folder, and then hopefully downloaded another copy. At the end of downloading, the same error message appeared. I went to the Applications folder anyway, and clicked on the icon, but the message appeared again: "This copy of the Install macOS Sierra application is damaged, and can't be used to install macOS" .
Don't use FireFox for this link…
https://itunes.apple.com/us/app/macos-sierra/id1127487414?ls=1&mt=12
You are a wizard! I was a little dubious about those steps, but the process worked very smoothly. Thank you very much for your patient assistance.
Great news, take care my friend! :)
Upgrading Mac Pro 5,1 from El Capitan to Sierra
