Commenting again because I really wanted a response for my last comment that was 3 months ago—I really wanted to use the model but am not sure if I will accidentally reproduce whatever made my issue happen.
Viewing post in Game Ready Model - Zelda comments
Sorry I missed your message. You'll want to leave workspace.mel where it was. The folder that contains that mel file should be set to be your project folder. To stop the hair flickering, turn on backface culling. The popup can be ignored. It has no effect on the rig. If you want it to stop showing, use the clean up file tool with everything turned off except "remove unknown nodes"