None of the physical or the windows-based vCenter servers are supported! You can enable vCenter-HA just for the VCSA (Appliance Mode).
VMware approaches that it's better for all costumers to migrate their virtual infrastructure management system, from any types of vCenter deployment to the Appliance deployment. So none ofthe new features and technologies like VCHA will be enabled for old type of vCenter server (physical or windows-based)