If you are looking for the software itself, it is available on several open-source and legacy hosting platforms:
Primarily handles native .kgb files but can also create standard .zip archives. KGB_01.rar
Is this related to a specific or repack (like the famous highly-compressed GTA IV archives)? KGB Archiver 2.0.0.2 File compression app for Windows If you are looking for the software itself,