This will take you to the Macs built-in Startup Manager that lets you pick a startup drive for the computer at boot time. How to use macOS High Sierra USB installer To use the USB installer, simply insert the USB drive and start up or restart your computer whilst holding the Option () key.

Terminal will provide a readout of the progress be patient Once the files have been copied and the USB drive has been made bootable, the drive will reappear on the desktop and Terminal will inform you that the process is complete. The USB drive will be unmounted throughout the process and will disappear from the desktop. If you moved the installer out of the Applications folder against my advice, you must edit the command to reflect its current location. NOTE: If you renamed the Install macOS High Sierra.app in your Applications folder (or your freshly formatted USB thumb drive) to something other than what I advised, you must edit the command to reflect your chosen names. Open a Terminal window and paste in the following command to move the installer to the USB drive and make it bootable: sudo ApplicationsInstall macOS High Sierra.appContentsResourcescreateinstallmedia -volume VolumesUSB -applicationpath ApplicationsInstall macOS High Sierra.app -nointeraction 5) Press Enter to execute the command and, if asked, type in your administrative password. Make sure there are no other volumes mounted with the same name. If the stick is not already formatted as GUID Partition Map and Mac OS Extended (Journaled), launch the Disk Utility application and format it thusly. This tutorial will be marginally easier if you leave the file name as the default: Install macOS High Sierra.app. If it is elsewhere on your computer, move it to the Applications folder. When the download completes and your Mac launches it, quit the installer and check that its still in your Applications folder. How to create macOS High Sierra installer 1) Download the High Sierra installer from Mac App Store. It has since been updated with appropriate instructions for the public macOS High Sierra release. NOTE: This article originally provided instructions for creating a USB install drive from a developer-only beta of macOS High Sierra.

Qt for mac sierra