Always use the Real Skies 2 feature. It provides natural HDR lighting that automatically sets the right mood and color temperature for your scene.
If you have encountered this specific file, here is a breakdown of why it is flagged as a high-risk entity by security researchers: Malware Distribution lumionprov120zmcoexe exclusive
The foliage and grass engines were significantly optimized in this version. Combined with the expanded library of high-quality assets (furniture, people, and nature), Lumion 12 allows for incredibly lush environments that don't bog down your computer’s performance. Addressing the "Exclusive" File: A Word of Caution Always use the Real Skies 2 feature