It installs an app named Install macOS Sierra into your Applications folder. Open this file and follow the onscreen instructions. macOS Sierra downloads as a disk image that contains a file named InstallOS.pkg.Enterprise administrators, please download from Apple, not a locally hosted software-update server. To get the required installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. If the installer opens after downloading, quit it without continuing installation. macOS Catalina, macOS Mojave, and macOS High Sierra download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave or Install macOS High Sierra.Boot the device that you want from the USB stick.Find the appropriate download link in the upgrade instructions for each macOS version: Run diskutil eject /dev/diskN and remove your flash media when the command completes.Start the 'Disk Utility.app' and unmount (don't eject) the drive. Note: If you see the error dd: /dev/diskN: Resource busy, make sure the disk is not in use. Use the same command but replace bs=1m with bs=1M. Note: If you see the error dd: Invalid number '1m', you are using GNU dd. Note: Using /dev/rdisk instead of /dev/disk may be faster. Execute sudo dd if=/path/to/downloaded.img of=/dev/rdiskN bs=1m (replace /path/to/downloaded.img with the path where the image file is located for example.Run diskutil unmountDisk /dev/diskN (replace N with the disk number from the last command - in the previous example, N would be 2).Run diskutil list again and determine the device node assigned to your flash media (e.g.Run diskutil list to get the current list of devices.dmg ending on the output file automatically. Hdiutil convert -format UDRW -o /path/to/target.img /path/to/source.iso Open the Terminal (in /Applications/Utilities/ or query Terminal in Spotlight).Tip: Drag and Drop a file from Finder to Terminal to 'paste' the full path without typing and risking typos. img file that you will be required to create from the. This quick step by step will show you how to make a bootable USB stick from a downloaded ISO image file using an Apple Mac OS X.
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