Info:

Arnold for Cinema 4D (or C4DtoA) provides a bridge to the Arnold renderer from within the standard Cinema 4D interface.

Features:
- Seamless integration with C4D: objects (instances, cloners, deformers, generators), MoGraph geometry, hair and splines.
- Support for both native particles and Thinking Particles.
- The fastest interactive rendering (IPR) of all Arnold plugins, allows parameter changes to be rapidly previewed without interrupting your work.
- Arnold Shading Network Editor, a node-based material editor.
- A comprehensive list of shaders and utilities, including vertex maps and per-face materials.
- Volume rendering with OpenVDB.
- Deferred, render time generation of geometry with the Arnold procedural node.
- Native linear workflow.
- Team Render, including single-frame distributed rendering.
- Support for third party plugins like X-Particles and Turbulence FD.
copy ai.dll to C:\Program Files\Maxon Cinema 4D R25\plugins\C4DtoA\arnold\bin

Win 10 x 64 test successfully