![]() If you have an Intel-powered Mac hold down the Option/Alt key while it is booting up. Plug the external drive into the Mac that you want to install the macOS on.Now you have the installer on the external drive you can use that to install copies of macOS on multiple Macs (as long as the Macs are supported by that version). How to use a USB installer to update your Mac When Terminal has finished copying the installer you will see the words Copy complete and Done appear.“Copying installer files to disk… Copy complete” and so on will appear in the Terminal window. Now Terminal will spend a few minutes copying the installer file to your drive.The process can take a while, you’ll see “Erasing Disk: 0%… 10%… 20%… 30%…100%… If you want to continue press Y and then Return. Terminal will warn that it is about to erase the drive (so make sure there wasn’t anything important on it – there shouldn’t be if you already formatted it as per the instructions above).Terminal may also ask for permission to access the removable drive.After typing in your password, press Enter. Note you won’t see characters appear as you type it in, that’s fine. Make sure that you use the name you have given your drive – e.g. Copy the text that corresponds to the version of macOS you are installing into Terminal – you’ll find the text in the section below.Otherwise you’ll find it in the Utilities folder). ![]()
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