Search for 'make a bootable High Sierra installer USB' will find you several links to methods to make that bootable installer that you need. (copying the app to a bootable disk will NOT work, unless you follow the proper steps to make it bootable. I would suggest that when you have the installer, that you copy that to another disk, where you can keep it safe. You can use that to make a bootable installer. THEN, you will have your copy of the installer, which will be in your Applications folder. All you need to do is wait for the installer window to open, then Quit the installer. OS X, and now macOS is only available as downloads through the App Store.įinally - when you download the macOS installer app, it will launch automatically when the download is complete. (Apple has not offered physical media/DVD/flash drive for at least 5 years (other than the old Snow Leopard DVD, which is still available from Apple ). It is more than 5 GB, so can take 30 minutes or more - be patientįinally, maybe you can't download High Sierra, because your Mac is too old to support installing the current system. Click on Download, then give it some time. Or click on the menu in the manu bar, select About This Mac, and then in the Overview section, click on the Software Update. What do you mean by 'refusing to allow the download'?ĭo you get an error message of some kind (what is that message?), or simply that nothing at all happens when you click on the download button? The download may take a couple of minutes to begin downloading, and appear that nothing is happening. On your Mac, launch the App Store app in the Applications folder.

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