Updating extension installed via policy and self-distributed as file


What’s the proper way to update an extension if it has been installed via the Windows registry like this.

	"*" : 
		"blocked_install_message" : "Custom error message.",
		"install_sources" : 
		"installation_mode" : "blocked"
	"extension@company.com" : 
		"install_url" : "file://C:\\Program Files\\Company\\Extension.xpi",
		"installation_mode" : "force_installed"

I’ve tried using new file names for the extension and updating the registry entry, but Firefox does not update the installed version. I also explicitly set the ExtensionUpdate setting but that made no difference.

Turns out updates are not currently supported.