Updating ufps within an existing project

Is there a particular way to update and re-import ufps within an existing project? I just tried this and I'm getting errors. I can import into a fresh project, but my old project gave me this:

Assets/Opsive/UltimateCharacterController/Scripts/Utility/Builders/ItemBuilder.cs(343,52): error CS0246: The type or namespace name `FirstPersonController' could not be found. Are you missing an assembly reference?
 
You can import it into an existing project, but you will need to ensure there aren't any namespace issues:

 
Ok. So I just deleted the Opsive folder in my project and then re-imported. That worked. Before I simply re-imported without deleting the old folder. I'm a little new to Unity.
 
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