These sites frequently offer "Sampler Packs." While they sell full libraries, their sampler packs often contain 3-5 high-quality HDRI domes specifically tailored for Cinema 4D.
Check (or Emission in Redshift) and load your HDRI file there. Apply the material to your Sky Object. Cinema 4d Sky Presets Free- Download
Get ready to take your 3D renders to the next level with these free Cinema 4D sky presets!" These sites frequently offer "Sampler Packs