vCenter Server provides centralized, unified management for the objects in vSphere environments like hosts and VMs. It is a requirement for a complete vSphere deployment. vCenter Server Standard – Highly scalable management with rapid provisioning, monitoring, orchestration, and control of all VMs in a vSphere environment.

Download from this https://customerconnect.vmware.com/downloads/info/slug/datacenter_cloud_infrastructure/vmware_vsphere/8_0 Install the program Login to your vcenter and apply the key your received.