Red cross on plugin

May sound like a newbie question, but, is there an easy way to buy / update a plugin if it has a red cross on it? How do I find what manufacturer it is and whether it is out of date or I need to but (after atrial version?)

That means the plugin was once there, but is now missing. What is the name of the plugin, and what category is it in?

It's a straightforward camera shake plugin - looks like the stock FCP one (but I do have others - which don't work either) Seems to have done this on the last update (FCP X 10.5.3) on Catalina

Please give exact information, like the name of the plugin and/or the developer. The plugin likely needs to be updated for the current version of the software, which I’d now 10.5.4.

Just updated to 10.5.4, still doesn't work

I'm not sure who made the plugins - but they have a picture of the Golden Gate Bridge in the icon, The stock FCP one doesn't;t work either

Every plugin has a name, and lives in a category, what are those?