The 675m looks like it's a GTX 580 - so in the Configuration of the plugin select "500 series" in the video card combobox.
The CUDA error says it all - it you have 41 different alphaimage and floatimage node bump and trans maps, but only space for 32 with your card. The later cards provide 64 slots instead of 32 for grayscale images.
You can either a) replace some of the bump maps with Octane procedural bump (ie. turbulence nodes, or similar), or b) simply remove some of the bump maps (in the plugin Materials tab rightclick the scene, or selected figure/props to remove the bump maps quickly).