First check your Quixel preferences to make sure source assets are set. Next, there used to be a bug where you needed to right click the metahuman and open the folder on disk and delete it then re-download. Let me know if neither of these works.
First check your Quixel preferences to make sure source assets are set. Next, there used to be a bug where you needed to right click the metahuman and open the folder on disk and delete it then re-download. Let me know if neither of these works.