vCenter Server 8.x
A fresh deployment of vCenter Server 9 as an alternative option to upgrade to vCenter Server 9 when upgrade from vCenter 8 fails.
Preparing for Deployment of the vCenter Appliance. Before you deploy the vCenter appliance, you must download the vCenter installer ISO file and mount it to a network virtual machine or physical server from which you want to perform the deployment.
The machine from which you deploy the appliance must run on a Windows, Linux, or Mac operating system that meets the operating system requirements. See System Requirements for the vCenter Installer.