As far as i know support will refund product only if files aren't downloaded and if something is technically wrong with the product (for example missing texture, missing parts of the model, misrepresentation etc. ). Contact support via support@cgtrader.com but i doubt that they will refund model since you downloaded files, and there is nothing wrong with the model itself technically. Just to be clear , even if they refund this model, since you have downloaded files you are not allowed to use it in any way, if you do, that will get into trouble. I'm saying this because there are buyers who are trying to exploit refund system in order to get models for free. I'm not saying that you are the one of them.