Logic Pro crashes when using Nectar

I've downloaded iZotope Nectar 4 from randomcracks, but when I'm using Nectar assistant, it listens to the audio for a few seconds and then crashes Logic, saying the system was overloaded. I checked the buffor many times, it was at 1024, all the other settings were correct. I've tried reinstalling the crack, it didn't work. Every other plugin from nectar was working without crashing, it was only the main one. Do you have any solutions for this? I'd be grateful for any help.