Use this page only if you are completely new to this product and not upgrading from a previous HIFI Tech product, then use this pageĪctive Sky for Prepar3D v4 ( ASP4) represents 17 years of weather simulation engine development! Building on the Active Sky weather engine experience, ASP4 brings a new 64-bit ASConnect simulator interface, 64-bit XGauge, new Air Effect enhancements, new Visibility Depiction enhancements and more, all specifically designed for Prepar3D v4!
