Error Installing Avatars 3.5.4

Hello - I have a new wordpress install running Supporter and I was getting ready to set up community but it requires messaging and avatar plug ins. I downloaded the Avatar 3.5.4 plug in and it contains a folder called avatars that is a little different from other plugins and looks more like an MU-plugin. Inside this folder are 3 files and a folder. Folder is called avatars-files and then outside of that are changelog.txt, avatars.php and avatars-bbpress.php. I've tried putting the files in the avatars folder into a new folder called avatars in plugins, I've tried moving the avatars-files and the other two php files into the plugin directory and tried the same in MU-plugins (but this would crash the site). When I tried first two methods I got a fatal error: __construct not defined line 73 in avatars.php. Not sure whats going on. Any help appreciated...