Recommended way is to use the manager. There should be no extra requirements needed. Manual way is to clone this repo to the ComfyUI/custom_nodes -folder.

The models are also available through the Manager, search for "IC-light". By default they go to ComfyUI/models/unet/IC-Light

Alternatively download them from here and place anywhere in the ComfyUI/models/unet -folder:

https://huggingface.co/lllyasviel/ic-light/tree/main

Some of the example workflows require the very latest features in KJNodes:

https://github.com/kijai/ComfyUI-KJNodes

https://github.com/kijai/ComfyUI-IC-Light/assets/40791699/c545a84f-3546-430e-b5dd-adce2ff19b6d

https://github.com/kijai/ComfyUI-IC-Light/assets/40791699/b406ee2b-c9cb-4f9a-9aac-6ab5f753420d