My understanding is fields, course variables and attributes all mean precisely the same thing. Even so, property is best explained from the stackoverflow backlink that you included in your problem. Are not able to set EPPlus licencing to non professional without the need of code breaking as 'LicenceContext is a https://propertyingurugram.in/m3m-india-to-develop-8-lakh-sq-ft-of-retail-space-in-gurgaon/