How to get rid of an "Add-in"?

[jesper8W75R]

I have an old add-in. 
I simply want to get rid of it.   But HOW?
I cannot find anywhere in the menus or preferences where I can delete it.

The error message doesn't give much help.
And the not-so-helpful "Learn More" takes me to a link that say I have to update the add-in from "Autodesk App Store". And sure, going there, I can download a new version of the add-in.
But I don't want it! It is not useful for me.

How to delete it and get rid of that notification message?

[davidpbest]

Some prefer to go to terminal and use grep.  LOL

[billbedford]

Yep, that would work too, but if people haven’t found the Application Support folder after years of using a Mac, I wonder if they would know what grep was, even if it bit them.