Then when that s done > see below instructionsġ - Shutdown computer and disconnect all external drive Except the newly created Bootable Installer.Ģ- Restart and immediately hold the OPTION key until the Startup Manager appears and choose the USB Drive.ģ - It will present options > Disk Utilities > View > View ALL attached Drives.Ĥ - Choose the Upper Most Drive ( not the volumes indented and list below ).ĥ - The drive normally is called Apple Media or Apple SSD - that is the drive to Erase and format as HFS Journaled with the GUID Partition Map.Ħ - Once that is done > backup out of Disk Utilities and choose install macOS.ħ - Follow the prompts and it may automatically reboot several time.Ĩ - Upon a final reboot - Setup Assist will present with the newer version of macOS. as we have the two powerful software like Virtualbox and Vmware Workstation, to install MacOS High Sierra on Virtualbox or Vmware then you will need a macOS High Sierra dmg file or you can say ISO file. If you can access some other Apple Computer that qualifies to run High Sierra - that might be the solution even if on a temporary bases to create the Bootable Installer If you are a Windows user then you have to download the dmg file from the link below and you know without virtualization software we can’t install any Mac operating system. The only way is by using an Apple Computer that qualifies to run High Sierra. Attempting from a Windows computer will not work, shall not and will never work.
