The topic of archiving copyrighted software is complex. Legally, downloading copyrighted XBLA games and DLC that you do not own constitutes copyright infringement in most jurisdictions.
That was the fatal flaw. Downloading the file wasn't enough. The file needed to "phone home" to the Xbox servers to verify ownership. Once the servers went dark, that phone line would be cut. The race was to download the files and ensure the license data was cached locally on a "dashboardOffline" profile. xbla dlc archive
Files for microsoft_xbox360_digital_part3 Files marked with are not available for download. Internet Archive The topic of archiving copyrighted software is complex
Community members test the dumped files to ensure they are not corrupted and contain the full, unvandalized game data. How Users Access and Utilize the Archive xbla dlc archive