A guildie of mine posted this in our forums:
Download Expired? | 11/10/2004 1:08:20 AM GMTST
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If you are getting a Download Expired error message when attempting to resume or start a download of the installer files, you are using a previous version of the Blizzard Downloader. Please download and run the latest version (linked below). When our web site came back in to action, it had not been updated with this new link. We apologize for the inconvenience.
Version 1.1.0 Installer:
Hope this helps