Ok... replying to my own post here with what I believe is the correct answer. If this is correct, it might be good to include in the installation instructions. I know this is pretty basic, but for anyone new to Unity, it might be pretty esoteric.
- I went to Assets/ClavianSuperTextMesh/Scripts
- right click->Assembly Definition and name it SuperTextMesh
- Go to the Assets/Scripts folder
- Select Main assembly file (NOT script named main, but the file with a puzzle piece)
- Add a new Assembly Definition in the Inspector
- Set new Assembly Definition to SuperTextMesh
If this is the wrong way to go about it, please let me know. This seems to be what it needed, though.