Since "Nos Keyboard" isn't a widely known mainstream brand, here are the most likely interpretations and the you might need:
Finding the official depends on the specific model of your peripheral, as NOS is a budget-friendly gaming brand often sold at retailers like Elkjøp and Gigantti . Official Software Downloads Nos Keyboard Software Download
An open-source alternative that provides lighting control without the heavy background processes of official apps. Since "Nos Keyboard" isn't a widely known mainstream