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pjg61 posted a topic in Multi-booting and VirtualisationI had posted a note earlier with little feedback so I thought I would post HOW TO INSTALL High Sierra on VMware Workstation 12.5.7 It is much easier than the complicated scripts that I have seen. Assuming that you have a functioning macOS system: 1) On your existing macOS, go to the App Store and download the High Sierra installer. Some people have reported that a stub installer is only downloaded although this has not happened to me. If it happens to you, follow the instructions on this page: http://osxdaily.com/2017/09/27/download-complete-macos-high-sierra-installer/ 2) The easy way to create a bootable USB is to use Install Disk Creator. It has been updated for High Sierra: https://macdaddy.io/install-disk-creator/ OR, Using a Terminal window, you could use the command: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/MyVolume Note: Replace "MyVolume" with the name of the macOS volume of your USB key 3) Create a new Virtual Machine in VMware Workstation. Select "Apple Mac OS X" as the Guest O/S and "macOS 10.12" as the version. Select the default for all other options (although I prefer to have the virtual disk as one single file) 4) Edit the newly created VMX file and append the two following lines: smc.version = 0 sata0:0.virtualSSD = "0" 5) Start your VM, and attach your USB key to the VM so that VMware can boot the installer. Proceed with a normal installation of macOS. Use Disk Utility to format the new virtual disk as a "Mac OS Extended (Journaled)" DO NOT SELECT APFS as your volume type. 6) Install High Sierra using all normal defaults. 7) Install the VMware Tools from VMware Workstation 14. There is new support for HiDPI displays which is great. 8) After a sucessful install, shutdown your macOS VM and edit the VMX file. Now change the virtualSSD value to a "1": sata0:0.virtualSSD = "1" The reason why you cannot install High Sierra in VMware Workstation 12 is that (in my understanding, someone may correct me), in the second phase of the install, the installer reformats the volume to APFS which Workstation 12 cannot boot from properly. But forcing macOS to think it is an HD disk and not SSD allows a proper install. Then changing it back allows macOS to see its virtual drive as an SSD and will not attempt to reformat it to APFS. If anyone has additional comments, please feel free to correct me or add.