How to Install NavMeshComponents

The Unity Github README document for the NavMeshComponents files states, “Clone or download this repository and open the project in Unity.”

When I attempt to open a new Unity project using any of the folders, I get the message: “Selected folder is not a unity project.”

So then how DO I install this?

Simply drop the files and folders under Assets in an existing Unity project.
You don’t need the rest for the components to work.

Thank you for replying. Would I then need to do this for every project?

Yes you would, just like any other asset.