Thanks LuckyPanda! As for the licensing, the way I understand it is that the interactive license is only needed when you include the actual 3D models in a game. So if you're making a Unity game and you use DAZ assets for props, environments and characters you need an interactive license for each asset.
If you just use the assets to create scenes and include the rendered images of them in a game you don't need that interactive license, just buying the assets is enough.