: OTOY provides a free demo version of OctaneRender. This version is meant for testing and contains limitations such as watermarks on final renders, but it is the safest way to learn the interface on your Cinema 4D R26 setup.
To install the plugin correctly, follow these steps to avoid common "missing plugin" errors: How to install Octane render for c4d r26? Octane Render Cinema 4d R26 Free Download
Registered users can often claim a free Prime tier that allows for rendering on a single GPU without watermarks. : OTOY provides a free demo version of OctaneRender