You also need a real Mac available in order to download High Sierra from the App Store and build the installation ISO. I’ll assume you already have Proxmox 5.1 installed. There is more documentation there which will help out with enabling extra features and diagnosing problems! Requirements This tutorial for installing macOS Sierra has been adapted for Proxmox 5 from Kholia’s GitHub project for installing into vanilla KVM. With the final release of Mojave, this tutorial is now out of date, see the new tutorial for installing Mojave instead!