The "download" aspect of the expansion functioned through several layers:

The release of The Burning Crusade (TBC) on January 16, 2007, marked the first expansion for Blizzard Entertainment’s World of Warcraft . This launch was a pivotal moment in gaming history, transitioning the industry from purely physical retail to integrated digital distribution models. Methods of Acquisition

📍 : For players looking for the expansion today, it is included in the standard subscription via World of Warcraft Classic .

Since you are looking for a "proper paper" regarding the download and release of World of Warcraft: The Burning Crusade , I have structured this as a formal overview of its 2007 digital and physical distribution. Executive Summary: The Launch of The Burning Crusade

: This allowed players to download the core engine updates and new talent systems weeks before launch.

: Users had to "Upgrade" their accounts via the Battle.net account management website by entering a CD key.

: Blizzard utilized a proprietary "Background Downloader" to deliver the 2.0.1 pre-expansion patch. Technical Implementation

: The "Standard Edition" and "Collector’s Edition" boxes included multiple CD-ROMs or a single DVD.