OTOY periodically offers time-limited trial versions of their Studio+ subscription package. This allows users to test the full feature set, including multi-GPU support, with Cinema 4D R25 before committing to a purchase.
OTOY provides a fully functional demo version of OctaneRender for users who want to test the software before purchasing. Go to the official OTOY website. Navigate to the downloads or trial section. Create a free OTOY account. Download the demo plugin compatible with Cinema 4D R25. octane render cinema 4d r25 free download
Extract the contents of the downloaded Octane folder into this plugins directory. including multi-GPU support