Some users need a delay script. Create a .bat file in the root folder with this:
Turn off Windows Real-time protection temporarily . Assassins Creed Black Flag Crack Fix
Run the .bat as Admin. This gives Windows time to load the crack DLL before the game panics. Some users need a delay script
If none of the above solutions work, you can try using a no-crack fix. A no-crack fix is a patch that can be applied to the game to bypass the DRM protection. Assassins Creed Black Flag Crack Fix