You can get it free for 30 days (Komplete Now trial). You can buy it used for cheap. But you cannot get a permanent full-functioning copy for $0 without breaking the law or risking malware.
Licenses for Ilya Efimov libraries are transferable via Native Instruments’ "Second License Transfer" system. ilya efimov nylon guitar kontakt free work download
: The library samples 17 frets on each string with a round-robin system. It even includes a "Round-Robin Chord System" to ensure that no two consecutive strums sound identical. You can get it free for 30 days (Komplete Now trial)