Installation

Install the module as any other module (https://www.drupal.org/docs/extending-drupal/installing-modules)

Download the SoundManager2 library from https://github.com/scottschiller/SoundManager2 to /libraries/SoundManager2-master

Assuming you are using the standard Drupal folder structure, these steps should add the SoundManager2 library correctly:

mkdir -p web/libraries
cd web/libraries
git clone https://github.com/scottschiller/SoundManager2 SoundManager2-master