In order to use the /js/awstats_misc_tracker.js option in the package I created, I overlooked an .htaccess restriction in the directory /home/admispconfig/web/ispc.awstats/js (you get this directory when installing).
In the parent directory, an .htaccess file is requesting you to enter a password, which is a limitation you need to remove in order to allow other websites to use the script.
The solution is really simple, and is added to the package you can download. The fix is to create an .htaccess file in /home/admispconfig/web/ispc.awstats/js, containing
Allow from All