If you're not using vCenter you don't have Update Manager. It's really that simple.
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if you connect via Browser directly to the ESXi Host than you use the "Host Client".
The WebClient is the Flex(Flash) based Client which is used when you connect to the vCenter with your Browser. The new HTML5 Version which is also offerd by the vCenter is "vSphere Client".
As the others already answers .. you need the vCenter which brings the VMware Update Manager into the game and indeed you havent use the "Web Client" yet.
Thank you for your response.
I was thinking I had an option of accessing everything via web-browser if didn't have vCenter.
and thinking "vSphere Web Client" is how I'm currently accessing the Host EXSi, which is not the case.
Now I'm learning that vSphere Web Client is a web-portal method to access the required vCenter if you want things like Update Manager.
Thank you for the clarification of the different clients, Joerg.
Thanks for additional insight of using CLI, Diego.
Looks like I'm testing the boundaries of the free version - CLI vs. Update Manager.
I'm going to inquire with VMware about exact specs I would need for my basic setup and get a quote.