It’s a pay for plugin last I checked so probably the plugin topic would be the place to ask. If not isn’t there a contact email when you bought it?
Besides that is there any examples or documentation you can refer to?
Is q3d one plugin or many? If it’s many then there probably is a master object you need to add. An example will have this.
You likely don’t want to get into the weeds of the plugin internals if you can help it. But threejs is what the plugin is based on so I would assume it’s included in it somewhere. Again that’s probably done by adding the correct object.
Anyways those are some ideas that may get you going. The answers aren’t too useful to me.