The Zoom Client Application must be installed before the Outlook Plugin can be installed.
Open a web browser and navigate to https://zoom.us.
If Outlook is open, close it now.
At the top right, hover over the "Resources" tab. Do not click.
Under the dropdown, click on "Download Zoom Client".
At the Download Center, click on the blue download button below "Zoom Plugin for Microsoft Outlook".
Run the downloaded installer "ZoomOutlookPluginSetup.msi".
Click "Next" through all of the prompts and do not change any of the settings.
Once the installer has finished, click "Close" and open Outlook.