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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://mirror.keystealth.org/centos/5.11/isos/i386/
http://mirror.us.leaseweb.net/centos/5.11/isos/i386/
http://mirrors.sonic.net/centos/5.11/isos/i386/
http://mirror.trouble-free.net/centos/5.11/isos/i386/
http://mirror.hmc.edu/centos/5.11/isos/i386/
http://mirrors.kernel.org/centos/5.11/isos/i386/
http://pubmirrors.dal.corespace.com/centos/5.11/isos/i386/
ftp://ftp.ussg.iu.edu/linux/centos/5.11/isos/i386/
http://mirror.millry.co/CentOS/5.11/isos/i386/
http://mirrors.cmich.edu/centos/5.11/isos/i386/
http://mirrors.adams.net/centos/5.11/isos/i386/
http://mirrors.maine.edu/CentOS/5.11/isos/i386/
http://mirror.team-cymru.org/CentOS/5.11/isos/i386/
http://mirrors.rit.edu/centos/5.11/isos/i386/
http://mirrors.cat.pdx.edu/centos/5.11/isos/i386/
http://centos.eecs.wsu.edu/5.11/isos/i386/
http://mirror.hostduplex.com/centos/5.11/isos/i386/
http://mirror.fdcservers.net/centos/5.11/isos/i386/
http://repo.dimenoc.com/pub/centos/5.11/isos/i386/

Mirrors Verified Tue Mar 31 20:56:12 2015 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