Maxon’s official learning portal has a resource section where artists share free assets. You can filter by "Sky" or "HDRI" to find user-generated presets.
as a sample from their professional training, which are easy to adapt to your own scenes. : A general repository where you can find over 180 free Cinema 4D sky models and scenes, such as park or outdoor setups. General HDRI Resources (Compatible with C4D) Many artists use a Dome Light Cinema 4d Sky Presets Free- Download
Whether you are rendering a futuristic city or a simple pack shot, the background matters. Sky Presets allow you to quickly switch between a gloomy overcast morning and a golden-hour sunset. This helps you "mood board" your scene rapidly without spending hours tweaking parameters. Maxon’s official learning portal has a resource section