http://wiki.centos.org/Download users are excited about new upcoming release, users are excited about new upcoming releases, a earlier an earlier the earlier version will no longer have SRPMs released from which updates might be build, and so, no longer receives security or other updates. no further SRPMs are released from the earlier version, from which updates can be built, so CentOS is no longer able to produce security or other updates. and as appropriate run updates in a post-install process: and run updates in a post-install process as appropriate: The netinstall image has information keyed to a particular anaconda contents, and always varies by point release. Each netinstall image is for a particular anaconda version; there is a new netinstall for every point release.