Installation is damaged: I'm trying to run a CD ROM in my MacBook Pro computer. The error message comes up "Application could not be installed because the installer file is damaged. Try obtaining a new installer file from the Application author".

1. I'm trying to run a CD ROM in my MacBook Pro computer.  The error message comes up "Application could not be installed because the installer file is damaged.  Try obtaining a new installer file from the Application author".     I believe I have Adobe Air on my computer.  It says it's not compatible.     2. I found an answer from 2015, but don't know how to execute the answer.  I need someone to walk me through this.