1. Downloading and Importing JSAM
If you haven't already, you can download the latest package by going to the releases page and finding the attached .unitypackage file at the bottom of the latest post.
Once you've downloaded the package, open up the Unity editor, find the Assets label in the top-most toolbar, hover over Import Package and click Custom Package...
From there, find the JSAM .unitypackage you just downloaded and select it to open it up in Unity.
Note: If you are upgrading from a previous version of AudioManager, then you are highly recommended to delete the previous package from your project before importing the new package.
In most cases, you'll want to just accept the default settings and import everything. If storage space is an issue, you can uncheck the Examples folder so you'll only take the essential files without any tutorials.
If you happened to have unchecked something by accident, you can always re-import the package again later.