How to import zipped package into Unity?

This can seem to be a very basic problem but I’m new to Unity and having great trouble with it and seem unable to find a solution.

I have an asset package for Unity in a zip file that’s supposed to contain vehicle models and example scenes. Now I am normally able to import assets into Unity projects when they are in .unitypackage format but can’t figure out how to do it now.

When I unzip the package, I just get a whole bunch of folders and meta files and scenes and there seems to be no way to import them as a whole into any Unity project. Help would be really appreciated. Thank you.

Sounds like this isn’t a package but a complete project. Unzip, then File → Open Project and select the root directory.