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You can find terms of general licence here: https://www.cgtrader.com/pages/terms-and-conditions Look for 21st paragraph.
In short, you can use models purchased from cgtrader, if that model will be inside proprietary format in your game and not easily accessible. You can't use models if those will be delivered in publicly accessible open or closed formats, like OBJ, JPEG, etc.
Thanks for your information."Proprietary Format" in my boardgame I do not know what does it means.I would buy it in a STL format and try to convert it to Solidworks for manufacturing it and make a toy so I will be selling it as a solid product not a designed File, for people like me that we only want to buy a 3D model design because we do not know how to do it and try to understand the License Terms is a bit confused .
Oh, it seems i misunderstood your original question. If you want to make a physical object out of purchased model and sell it as a part of board game, then general license allows to do that, as captainmarlowe already said. But you may contact cgtrader support staff, just to make sure. Support form is on lower left part of cgtrader page.
