The Bori Hang ver.1.8 is a user-created mod, not an official product from NNG (the developer of IGO). It typically replaces or overwrites system .zip or .wav files. Users should always back up their original voice files before installation. The voice pack is distributed as abandonware/fanware, intended for users who already own a legitimate IGO license.
: This was a major milestone where the navigation sound was completely rebuilt from the ground up to improve clarity and timing. igo magyar gps - bori hang ver.1.8