2014-06-14 Links to download NVidia Optix 3.0.1 (old version) RAY_TRACE Win32 : http://developer.download.nvidia.com/assets/tools/files/optix/3.0.1/NVIDIA-OptiX-SDK-3.0.1-win32.exe Win64 : http://developer.download.nvidia.com/assets/tools/files/optix/3.0.1/NVIDIA-OptiX-SDK-3.0.1-win64.exe