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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.usinternet.com/centos/5.11/isos/i386/
http://mirrors.umflint.edu/CentOS/5.11/isos/i386/
http://mirror.hmc.edu/centos/5.11/isos/i386/
http://mirrors.tripadvisor.com/centos/5.11/isos/i386/
http://repos.dfw.quadranet.com/centos/5.11/isos/i386/
http://mirrors.evowise.com/centos/5.11/isos/i386/
http://ftp.osuosl.org/pub/centos/5.11/isos/i386/
http://centos.mirrors.wvstateu.edu/5.11/isos/i386/
http://reflector.westga.edu/repos/CentOS/5.11/isos/i386/
http://dist1.800hosting.com/centos/5.11/isos/i386/
http://repos.lax.quadranet.com/centos/5.11/isos/i386/
http://mirror.trouble-free.net/centos/5.11/isos/i386/
http://mirror.team-cymru.org/CentOS/5.11/isos/i386/
http://centos.mirror.lstn.net/5.11/isos/i386/
http://repos.forethought.net/centos/5.11/isos/i386/
http://mirror.stjschools.org/public/centos/5.11/isos/i386/
http://mirror.eboundhost.com/CentOS/5.11/isos/i386/
http://mirror.mojohost.com/centos/5.11/isos/i386/
http://mirror.keystealth.org/centos/5.11/isos/i386/

Mirrors Verified Mon Apr 3 11:13:56 2017 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