I've tried to uninstall through the app but it asks for a password from the "Symantec Endpoint Protection Manager administrator". I'm an admin for this account on the Mac so I should be able to remove everything manually. How do I do that? I'm specifically using version 14.0.1.
In case the first link goes away, the easiest way to run it is to control-click on the download, choose "Open with..." -> "Terminal" and follow the instructions. You'll need to have admin privileges on the Mac but you won't need the "Symantec Endpoint Protection Manager administrator" password.