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I downloaded macOS High Sierra Installer (full) from App Store, but it claimed it was not a valid Installer when I tried to make a bootable USB drive. Now the App Store download page only offers Open option in menu, but does not offer Download option.
iMac, macOS 10.12
Hello chg5000,
Thank you for using Apple Support Communities! I understand from the information you provided that you’re having trouble creating a USB installer for High Sierra; I'd like to help.
The following support article provides the link to download High Sierra:
How to upgrade to macOS High Sierra - Apple Support
If you need the instructions for how to create the installer, this link will help:
How to create a bootable installer for macOS - Apple Support
Best Regards.
Hello chg5000,
Thank you for using Apple Support Communities! I understand from the information you provided that you’re having trouble creating a USB installer for High Sierra; I'd like to help.
The following support article provides the link to download High Sierra:
How to upgrade to macOS High Sierra - Apple Support
If you need the instructions for how to create the installer, this link will help:
How to create a bootable installer for macOS - Apple Support
Best Regards.
If you see open when trying to download, then it means you have already downloaded the installer. Look in either Downloads folder or Applications folder and find and delete "Install Mac OS High Sierra". Then restart and try again.
Thank you for your reply.
I had downloaded the installer, to the point at which it opened, (& I could Quit it), but it turns out it had not completely downloaded, as it was both smaller that it should be, and the associated .download file was still present, and indicated not fully downloaded.
So my question is: If the download is faulty, how do you download it again?
Brilliant!
I'd never have guessed that a restart of the Mac would cause an App Store page to offer me a significantly different window & menus.
Problem solved. Many thanks.
chg5000 wrote:
So my question is: If the download is faulty, how do you download it again?
Just as I said above. It's the not installer that's faulty, just your copy of it.
You're welcome.
Cannot Download macOS from App Store
