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Connect to the ESXi via VI Client.<br />
<br />
Go to Configuration Tab-&gt; Licensed features<br />
<br />
On the top right you should see an &quot;edit&quot; Click on it and enter license
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Connect to the ESXi via VI Client.

Go to Configuration Tab-> Licensed features

On the top right you should see an "edit" Click on it and enter license

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What is this VI client? Do you mean vSphere?
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What is this VI client? Do you mean vSphere?

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I'm having trouble finding where to add my registration key for ESXi v4.0.0 Update 1.
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I'm having trouble finding where to add my registration key for ESXi v4.0.0 Update 1.

VMWare ESXi Registration 4.0.0 Update 1

The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.

Microsoft Server OS

VMware, a software company founded in 1998,  was one of the first commercially successful companies to offer x86 virtualization. The storage company EMC purchased VMware in 1994. Dell Technologies acquired EMC in 2016. VMware’s parent company is now Dell Technologies.

VMware has many software products that run on desktops, Microsoft Windows, Linux, and macOS, which allows the virtualizing of the x86 architecture.  Its enterprise software hypervisor for servers, VMware vSphere Hypervisor (ESXi), is a bare-metal hypervisor that runs directly on the server hardware and does not require an additional underlying operating system.