"No CUDA Device Selected" Error with OctaneRender Demo in C4D - NVIDIA RTX 5070 (Win 11, Driver 576.52)

[chltnqls121]

I'm encountering an critical issue when attempting to use OctaneRender Demo within Cinema 4D. The error message I receive is: "there is no cuda device which is selected". This prevents OctaneRender from running entirely.

My system specifications are as follows:

CPU: AMD Ryzen 7 9700X 8-Core Processor

GPU: NVIDIA GeForce RTX 5070

Operating System: Windows 11

NVIDIA Driver Version: 576.52

Software: Cinema 4D with OctaneRender Demo plugin

I have verified that my NVIDIA GeForce RTX 5070 is correctly identified in Windows Device Manager and dxdiag. I have also ensured that the latest NVIDIA driver (version 576.52) is installed.

Despite my GPU being recognized by the system, OctaneRender in C4D specifically states that no CUDA device is selected, which is preventing any rendering. I understand OctaneRender relies heavily on CUDA, and this is severely impacting my workflow.

Could anyone please provide immediate guidance on how to resolve this? I am particularly looking for solutions related to:

Ensuring OctaneRender correctly detects and selects my NVIDIA RTX 5070 as a CUDA device.

Specific settings within OctaneRender's preferences (e.g., Device Settings, CUDA visibility) or C4D plugin settings that might need adjustment.

Troubleshooting steps for potential conflicts or configuration issues between the NVIDIA driver, Windows 11, C4D, and OctaneRender.

Are there any known compatibility issues with driver version 576.52 or Windows 11 that I should be aware of?

Could using the demo version of OctaneRender be a factor in this issue?

Any urgent assistance, insights, or detailed steps to get my OctaneRender working would be immensely appreciated.

Thank you.