In this video the instructions say to go to Object > Relations > Make Library Override. In my version of Blender (4.1.1) that does not work, but I found it under Object > Library Override > Make.
Hey Joshua! It is recommended to use the Blender version used in the course whilst learning, it will help you learn the 3d skills without the worry of also navigating and learning Blenders UI changes at the same time.
I think adapting an old tutorial to the most recent version makes you learn more, since you have to investigate what changed it also now you can adapt other tutorials you watch easily.