Log in to your OTOY account and download the specific plugin build for "Cinema 4D R20."
A monthly/yearly subscription for full features. Octane Render For Cinema 4d R20 Free Download
If you plan to use Octane with R20, version 4.0 is your most suitable option. However, be aware that achieving a stable configuration may require testing different NVIDIA GPU drivers, as compatibility between GPU drivers and rendering plugins can sometimes cause unexpected behavior. Users experiencing crashes should be prepared to systematically troubleshoot their setup or consider whether upgrading to a newer Cinema 4D version (and corresponding Octane version) might better serve their production needs. Log in to your OTOY account and download