Which is not available for download on the Apple app store. You must download the macOS High Sierra VMware Image (VMDK) file. In fact, if you want to install macOS High Sierra on VMware Virtual Machine. Which is free to download and install on a virtual machine like VMware and VirtualBox. For any other operating system, you will surely search for ISO file on their official website.
Typically, you will need to download the operating system installer file. Are you willing to install macOS High Sierra as an isolated operating system on a Windows PC, Using VMware Workstation? Hp scanner for mac os x.
