Hold down the or (⌥) key on the keyboard and power on the device.

Plug in your macOS High Sierra bootable flash drive.

this will redirect you to the App Store High Sierra page. Go to Section 4 and click on Get macOS High Sierra. (My mac is/ was capable of running High Sierra) Open Safari and click on this link, How to upgrade to macOS High Sierra - Apple Support. I am doing this on a mac with macOS Mojave 10.14.6 installed.I should install macOS High Sierra operating system there are no worries, installing macOS High Sierra on VMware workstation is a bit easy then VirtualBox Therefore. Still, if you are thinking that where or in which guest machine. Download Macos High Sierra 10.13.1 Iso Installer For Mac Vmware And Virtualbox Mac Os X Iso Download For Virtualbox.

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