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Trying to download macOS High Sierra from the App Store (to wipe and reinstall macOS on an old MacBook Air), following the link from:
https://support.apple.com/en-us/HT208969
I get an error when downloading - "Update not found - The requested version of macOS is not available."
MacBook Air
The downloaded installer was correct, but booting from the USB disk wasn't working for me.
I went out and got a new USB stick (just in case) and tried again using createinstallmedia - this time it worked!
So to summarize the solution:
The downloaded installer was correct, but booting from the USB disk wasn't working for me.
I went out and got a new USB stick (just in case) and tried again using createinstallmedia - this time it worked!
So to summarize the solution:
Don't use Firefox for this link...
https://itunes.apple.com/app/macos-high-sierra/id1246284741?mt=12
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...
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 more recent version can be downloaded.
If you have downloaded the Install macOS High Sierra.app and it appears in your Applications folder, it should
be 5.23GBs in size.
What did you do next, did you follow the instructions in this article,
How to create a bootable installer for macOS – Apple Support
if so you should have created a bootable USB installer.
When you then plug this bootable USB installer into the MacBook Air did you Restart it
while pressing and holding the option/ alt key. After a couple of minutes you should see the
Startup Manager where you select the bootable USB and press Return.
The USB should boot up where you will see a Utilities panel where you use Disk Utility to
erase the macs Disk, and then use Install OS to install High Sierra.
I was able to download after removing the old copy, but the new copy has the same problem I was having before - the USB boot image from createinstallmedia won't run on my late 2010 MacBook Air (get the circle with a slash symbol after booting from it...), but High Sierra is definitely compatible (that's what was on there before).
Unable to download macOS High Sierra
