This Plugin is either broken on Vaadin 14.8 or it is so horribly documented

This Plugin is either broken on Vaadin 14.8 or it is so horribly documented that even after 5 hours of trying to set it up (while also looking at the GitHub Source Code) I could not make it work.

The Button does not even register a ClickListener (I looked at it via Inspect Element) so I am generally very confused.