ComfyUI-3D-Pack cannot be installed, even using Desktop App

ComfyUI-3D-Pack installation will not complete using the Manager.

This is the Comfy Desktop app for Windows. Installation hangs session and the script window goes black, and CUI must eventually be killed. I'm not sure what it's done/changed and its not recognized as being installed after a restart despite that the folder is created in custom nodes and seems to be populated.. but in the Manager it does not show as installed.

I just deleted the folder created in custom nodes) not knowing what its state was.

Should it still be listed in the Custom nodes Manager?

Thanks.