To apply a license key to your ESXi 6.5 host:
An ESXi 6.5 license key is a unique code required to activate and use VMware ESXi 6.5, a popular hypervisor for virtualization. The license key is used to unlock the full features of ESXi 6.5, allowing users to create and manage virtual machines, enable advanced features, and receive support from VMware. esxi 6.5 license key
The ESXi 6.5 license key can be found in the following locations: To apply a license key to your ESXi 6