The Cats.txt wasn't showing up in the folder when I downloaded it from the instructor's dropbox. I opened a new blender file, opened his .blend file with all the assets, catorogorized and resaved all the assets and it worked!

Thanks for checking on this for me! B

The Cats.txt wasn't showing up in the folder when I downloaded it from the instructor's dropbox. I opened a new blender file, opened his .blend file with all the assets, catorogorized and resaved all the assets and it worked.