Cannot Uninstall Zoom Plug In for Outlook

I had a similar problem for about a year now where I could not upgrade or uninstall the Zoom Outlook Plugin.  I was finally able to update (haven't tried uninstall yet) the Zoom Outlook Plugin by going to the register editor "Computer->HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products" and going through the entries until I found one with a ProductName of Zoom Outlook Plugin.  I then deleted that key and rebooted.  After that, the missing .msi message was gone when I attempted to update the plugin.  I was able to update the plugin to the latest version.  I would think after that I (and you) would be able to uninstall the plugin if desired.  Hope this helps.