Allow developer for users of new OSX operating systems from Apple
Our security system against unauthorized copy software it's not compatible with "notarize" Apple's system, how they call their control system. This control system cannot guarantee by far that the programs are free from malware!
How to fix this problem:
First try to open the BrainWaveProducer application.
Then go to System Preferences > Security & Privacy > General tab the last line with "was blocked from use because it is not from an identified developer", click Open Anyway
In most of the cases this solution will work.

Still don't works, try this solution
Open Terminal and type: sudo spctl --master-disable then hit Return
Click on System Preferences, choose Security & Privacy, tap the lock at the bottom left of the screen, enter your password to unlock Security and Privacy, choose the Anywhere under Allow apps downloaded from
This solution will definitely works