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Once 3Delight for Cinema4D in loaded in Cinema4D, you can use 3Delight menu to add 3Delight Menu and Shelf into Cinema4D. That will make it easier to render using 3Delight or to create materials and lights. The free 3DelightNSI does not require a licence file, but if you are running the paid version and you have no license file installed, you will have a watermark in the image when you render. Installing a license file is explained in Configuration.