This is a full, real SDK for the classic Unreal Tournament with totally new features, methods and tools improving the Unreal Engine 1 in a wide range. Next to tons of new visual features it improves overall physics (has it's own build-in Physics Engine "Thelema Physics" or short "tPhys"), has loads of gameplay and AI enhancements, a new render (currently OpenGL only) to deal with hardcoded features and bundled tools.
The Download for the Demo Version of the Extension Pack for UT99. It contains mostly new basic features like Emitters and Lensflares and can be seen as...