8.4.2: Code in CKEditor addon - JS error "codesnippet" was not found

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I've installed the addon, it's enabled in the Dashboard. But when I load an editor it throws the following error:
Error: [CKEDITOR.resourceManager.load] Resource name "codesnippet" was not found at "http://localhost/c584/concrete/js/ckeditor4/vendor/plugins/codesnippet/plugin.js?t=I2QI".

Both the ckeditor and highlight js and highlight css are loaded in the page. And the pluginManager shows the codesnippet plugin is available.

Why doesn't it load?

Has anyone successfully installed and used this addon? What am I missing?

linuxoid