Here is proper and working release of Kontakt 4.1.1 for Windows by AiR group. Read NFO for more info about it.
Description: With version 4, KONTAKT enhances its position as the professional’s sampler of choice. Building on the outstanding features of the previous versions, including the unrivaled audio engine and state-of-the-art semi-modular architecture, KONTAKT 4 delivers new sonic horizons for your music. An expanded sound collection connects you to an immense number of instruments, and the new Authentic Expression Technology (AET) is at the cutting-edge of dynamic and true instrument simulation.