As of Ares v5.0, addons are no longer installed by default. The default addon installation was known as the Atlas Helpers Library. Some addons, such as VuFind or Amazon Book Searches, are dependant on other addons to run properly.
Atlas Helpers Addon Library
Atlas Systems, Inc.
Contains helper methods for use with user addons.
This Addon is included by default when Ares is installed.
The Atlas Helper’s Library is installed like any other addon. Download and extract the AtlasHelpers files (AtlasHelpers.lua and Config.xml) from the zip file to the addon directory. Default location: MyDocuments\Ares\Addons\Atlas.