You have exceeded the daily download quota.
Sorry, We cannot sustain high bandwidth hogging (mass downloads) of the site. Please stick to making a reasonable number of requests per day that does not trip up the download quota system, or use the Peer to Peer solution (Bit Torrent) to obtain a less up-to-date but nonetheless massive snapshot of the archive.
You will be able to resume downloading tomorrow :)
If you utilize a auto-downloading bot, please use rate limiting, you can obtain a maximum of 2000 downloads per day.
By the way, http://tracker.modarchive.org/ is where you can obtain a large chunck of the archive in one go, we have it in a torrent just for folks like yourself :)