I notice you're asking about decrypting .kn5 files with the word "exclusive," which typically refers to proprietary 3D model files from (used in Assetto Corsa ). Let me clarify the legal and technical situation.
This is a security feature where the model is tied directly to the original data.acd file. how to decrypt kn5 files exclusive
A popular tool where you simply drag the KN5 file onto the executable to generate OBJ or FBX files and a textures folder. I notice you're asking about decrypting