To install Addreality Player on macOS you will first need to install Adobe Air components for macOS
After installing Adobe Air you need to download latest version of Addreality Player, which you can get from "Downloads" section of your CMS.
To install Addreality Player simply run downloaded package and select "Install"
After that you can alter installation location if needed
Press "Continue" to finish the installation, after this Adreality Player will be installed and ready to use.