If the "Basic Lights" content isn't in the "Included" or "Core Content" sections that you've downloaded, it might be worth checking if there are additional content packs available, either from the same source where you obtained the "core content" and "humans-other," or from third-party vendors. You might consider looking through the official Poser forums or community websites for more information, as fellow users might have insights into where to find this specific lighting set or whether it's available as an additional download.