“Your controller is enough. Go look in the mirror. The skin is already there.”
You can find various skins through official and community channels: Pioneer Ddj-400 Virtual Dj Skin Download
You do not necessarily have to use an external web browser. You can search for and install skins directly via the "Extensions" tab in your VirtualDJ settings. ⚙️ 2. How to Install the Skin “Your controller is enough