vSphere Essentials Pack is a license that entitles the purchaser to run up to three dual CPU ESXi hosts managed by an included vCenter server essentials edition. There is no limit to the number of virtual machines (VMs) that can be run on those hosts and kits are available to enable both Standard and Enterprise Plus features. Packs must be independent of each other, for example the vCenter Server Essentials cannot be used to manage other server hosts not included with this kit.
Vmware Vcenter Server 8 Essentials Download