Regarding the 2023 version, I found that RealFlow Cinema 4D 2023 is not yet released. However, you can still download and try the latest version of RealFlow Cinema 4D, which is compatible with Cinema 4D R25.
Internal Meshing: High-quality mesh generation that recognizes Cinema 4D’s native fields and forces. How to Access RealFlow for Cinema 4D realflow cinema 4d 2023 free download
Maxon, the company behind Cinema 4D, offers a comprehensive trial for its entire ecosystem. Since recent versions of C4D (2023 and 2024) include core RealFlow technology inside the native system, you can access fluid tools directly. Regarding the 2023 version, I found that RealFlow