Launch Greyscalegorilla Studio and download any HDRI you would like to use.
2. In Cinema 4D go to Redshift menu > Lights and create a Dome Light. In this guide we will be using Redshift as renderer however the workflow is similar for all renderers.
3. Switch to Studio click and drag the downloaded HDRI thumbnail into the Dome Light > General > Texture section Path box. (Or you can click the "Copy" icon on HDRI thumbnail and then paste into the Texture path box.)
4. After you assign the HDRI you will see it on the viewport and you can also render your scene to confirm it's working.