First, familiarize yourself with the interface and tools of V2.5 Studio. Look for sections or tabs related to lighting.
It sounds like you are looking for a way to use without the high cost of a professional license. While the idea of a "crack" or "exclusive download" might seem like a quick fix to get your studio lighting simulations running, it often leads to more stress than it's worth.
For any software, it's recommended to download it from official sources. This ensures you get a legitimate copy with full functionality and support.