1- Download latest version of NIC2 from here: https://www.neuroelectrics.com/products/research/software
2- Follow the next step command:  
sudo chmod -R 755 path/to/app

Where path/to/app is the path to NICMAC_2.1.3.11_Setup.app



If a message appears, stating that the software can not be installed, then follow the next steps:


  1. Open System Preferences > Security & Privacy.
  2. In the General tab, you’ll see a message saying the file was blocked.
  3. Click “Allow Anyway”.
  4. Then, double-click the Setup_NICx.x.x.xx file again to open it.
  5. If the warning appears again, choose “Open” when prompted.
? This message appears because the app hasn’t been signed by an identified Apple developer. If the file comes from a trusted source (like Neuroelectrics), it is safe to proceed.