Fortunately, the installer allows you to print and save these policies by clicking one of these buttons accordingly. Click "Continue" to advance to the next step of the installation process.
A dialogue window will pop up prompting you to accept the terms of the software license agreement. Click the "Agree" button to install, "Disagree" to exit the installer and quit installation or the "Read License" button to read the agreement.
Steps to Downloading, Installing Messages for Mac