Also, we recommend you uninstall the Connector, then go to the 5.3 Engine/Plugins/Marketplace/NVIDIA folder and delete anything that’s left over. Then reinstall.
If it still doesn’t work, please check if omniclient.dll is in the system path. To test this, you can go to a cmd prompt in any folder and type where omniclient.dll — if it finds anything then that location must be removed from the system path.