Do the following to silently install Flash Player 11.3 on Mac OS:

Note: What follows is the only supported method to install Flash Player silently on Mac OS. Other methods, such as extracting and installing the .pkg file, are neither supported or recommended.

  1. Extract the Adobe Flash Player installer bundle (Install Adobe Flash from the .DMG file.
  2. Open a terminal window and change to the directory where the .app file is saved.
    For example, if the .app file is saved on the Desktop of the current user, type: cd ~/Desktop
  3. Run the installer contained in the .app file using the following command:
    sudo ./Install Adobe Flash Flash Player Install Manager -install
  4. Type the password to proceed with the installation.
    Note: It's necessary to be a super user to proceed with the installation.