Scientific Linux 6.x

HTTP и FTP линки:

Scientific Linux 6x Our latest stable release of Scientific Linux 6

http://ftp1.scientificlinux.org/linux/scientific/6x/i386/iso/
http://ftp1.scientificlinux.org/linux/scientific/6x/x86_64/iso/
ftp://ftp.scientificlinux.org/linux/scientific/6x/i386/iso/
ftp://ftp.scientificlinux.org/linux/scientific/6x/x86_64/iso/

Так же, скачать можно с торрентов:

Public Torrent

Public Scientific Linux Torrent Servers

Основной образ для инсталляции:

http://ftp1.scientificlinux.org/linux/scientific/6x/i386/iso/SL-65-i386-2013-12-16-Install-DVD.iso