These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.
Download macOS
Find the appropriate download link in the upgrade instructions for each macOS version:
Mac Disk Image Download
System Disk Utility 2.6.2 for Mac OS X Server 1.2 is a Mac OS program that allows you to select which hard disk your computer will start up from. These empty disk images range from 3GB HFS formated (appropriate for Mac OS 6, 7 or 8.0) up to 32GB HFS+ formated (Mac OS 8.1, 9 or early Mac OS X). Note: Please be patient when extracting these blank disk images, as your hard disk has to write the whole space (up to 30GB) so it might take a couple minutes depending on your computer specs. Mac OS X: 3 GiB. Darwin: 1.5 GiB. Others: 3 GiB are OK. Now let's go: Windows users: Download an empty hard disk and uncompress it (you need a decompressor that supports.bz2, download WinRar or bzip2). UN.X folks: Create a disk image by executing: $ dd if=/dev/zero of=myharddisk.img bs=516096 seek=6241 count=0 which will create a disk image. This article deals with transferring an existing Mac running Mac OS X / OS X / macOS to a virtual machine, or take a bootable storage device/clone/disk image and convert it into a virtual machine. If you would prefer to set up/install a virtual machine with a clean Mac OS X/OS X/macOS from scratch please see one of the following articles instead.
macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
OS X El Capitan
El Capitan downloads as a disk image. On a Mac that is compatible with El Capitan https://everloans335.weebly.com/blog/handbrake-download-mac-106-8. , open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer. Use the 'createinstallmedia' command in Terminal
* If your Mac is using macOS Sierra or earlier, include the
--applicationpath argument, similar to the way this argument is used in the command for El Capitan.
Use the bootable installer
After creating the bootable installer, follow these steps to use it: https://everloans335.weebly.com/blog/snagit-11-for-mac-free-download.
Mac Os Disk Image Download
Learn moreOs X Disk Image Download
For more information about the
createinstallmedia command and the arguments that you can use with it, make sure that the macOS installer is in your Applications folder, then enter this path in Terminal:
Mojave:
High Sierra:
Mac Os Virtual Disk Image
Packet tracer latest download. El Capitan:
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