The 1.8 iteration of the HDRI Studio Pack (often distributed as a ZIP archive) refined the original "HDRI Studio Rig" plugin to offer better integration with newer versions of Cinema 4D.
: The pack includes environments in both .exr and .hdr formats, offering compatibility with a wide range of applications and ensuring that you can use them in various projects and software. GSG HDRI Studio Pack 1.8 for Cinema 4D.zip
Each HDRI has a matching low-res preview (same name) for viewport speed. Switch to the high-res before final render. GSG HDRI Studio Pack 1.8 for Cinema 4D.zip