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In order to conserve the limited bandwidth available .iso images are not downloadable from mirror.centos.org

The following mirrors should have the ISO images available:

http://mirrors.advancedhosters.com/centos/5.11/isos/x86_64/
http://mirror.us.leaseweb.net/centos/5.11/isos/x86_64/
http://mirror.pac-12.org/5.11/isos/x86_64/
http://mirror.steadfast.net/centos/5.11/isos/x86_64/
http://centos-distro.1gservers.com/5.11/isos/x86_64/
http://mirror.compevo.com/centos/5.11/isos/x86_64/
http://mirror.beyondhosting.net/CentOS/5.11/isos/x86_64/
http://mirror.math.princeton.edu/pub/centos/5.11/isos/x86_64/
http://mirror.web-ster.com/centos/5.11/isos/x86_64/
http://mirror.n5tech.com/centos/5.11/isos/x86_64/
http://repo1.dal.innoscale.net/centos/5.11/isos/x86_64/
http://mirror.sesp.northwestern.edu/centos/5.11/isos/x86_64/
http://repos.dfw.quadranet.com/centos/5.11/isos/x86_64/
http://centos.eecs.wsu.edu/5.11/isos/x86_64/
http://mirror.vtti.vt.edu/centos/5.11/isos/x86_64/
http://centos.mirror.lstn.net/5.11/isos/x86_64/
http://mirror.fusioncloud.co/pub/centos/5.11/isos/x86_64/

Mirrors Verified Wed Aug 24 09:48:01 2016 UTC

Or use bittorrent to download the .torrent files provided.

Bittorrent is a peer to peer download system described at http://bittorrent.com/ and there are many clients available.

These include (in no particular order of preference): utorrent, vuze (Azureus), BitTorrent, Deluge, ctorrent, ktorrent, rtorrent and transmission.

Packaged copies of various torrent clients for CentOS can be found in the repositories listed in the following wiki article : http://wiki.centos.org/AdditionalResources/Repositories