Kontakt libraries are not just audio files. They contain scripts (KSP - KONTAKT Script Processor). A malicious crack can embed code inside an .nki file that:

Adding a cracked library to Kontakt 7 is a process that involves several steps, but it's essential to note that using cracked libraries can pose significant risks to your computer's security and violate software licensing agreements. Many software and sample library creators invest considerable time and resources into their products, and using cracked versions deprives them of fair compensation for their work.

If you are a producer trying to save money, use (Free) and download legitimate free libraries:

Always use legitimate software and libraries to support the creative community and ensure the best possible results in your music production.