VMware vCenter Server 8 Essentials - Lifetime 1 Device (Global)

With vCenter Server 7 Essentials, VMware has integrated many great new features that allow vSphere administrators to more efficiently manage their vSphere infrastructure. VMware vCenter Server Essentials provides the centralized management plane of the VMware vSphere solution and allows creating clusters of VMware ESXi hosts. By creating vSphere clusters with vCenter Server, this enables the enterprise vSphere capabilities and features.

Download the software from the Official Site.
Login to your root.
Go to Manage -> License
Enter the key.