High Sierra: How to upgrade to macOS High Sierra – Get macOS High Sierra (App Store link) Mojave: How to upgrade to macOS Mojave – Get macOS Mojave (App Store link)Īs of recently ( October 2019) users have reported a certificate issue that may require the system datetime to be backdated via terminal in the installer. Once pasted and corrected, press enter, then enter your password for macOS. Sierra: How to upgrade to macOS Sierra – Download macOS Sierra (direct d/l). Make sure to change the element titled 'USBdrive' for the name of the drive you intend to become the bootable installer. The app's ressources can be used to create a new installer thumb drive with the well known command: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/MyVolume -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app The installer package installs the "Install OS X El Capitan.app" in the Applications folder. Steps to Create a macOS bootable USB on Windows 10/8/7 PC. TransMac software trial version would be sufficient. Simply download a new OS X El Capitan install.dmg (with a valid cert chain this time), open the dmg and open the InstallOS.pkg. A problematic Mac PC with OS X or MacOS Sierra 10.12 or a later version. You can now quit Terminal and eject the volume.You probably used an old macOS installer app to create your USB bootable disk.Ī lot of macOS installer apps downloaded before Oct 2019/Nov 2019 contain an outdated certification chain and thus are invalid. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina.Download the InstallMacOSX.dmg from Section 4 of How To Upgrade To El Capitan Double-click to open InstallMacOSX.dmg to Install MacOSX.pkg. Terminal shows the progress as the bootable installer is created. Creating the Install OS X El Capitan.app on a mac that came with a newer OS than El Capitan. When prompted, type Y to confirm that you want to erase the volume, then press Return.Terminal doesn't show any characters as you type your password. When prompted, type your administrator password and press Return again.If it has a different name, replace MyVolume in these commands with the name of your volume. These assume that the installer is still in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. The installer you create can be used to install OS X El Capitan 10.11 on any eligible Mac computer. Type or paste one of the following commands in Terminal.Open Terminal, which is in the Utilities folder of your Applications folder.
Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
Connect the USB flash drive or other volume that you're using for the bootable installer.
Use the 'createinstallmedia' command in Terminal
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