Scientific Linux 6.2 (SL 6.2) has been released for both i386 and x86_64 architecture. Scientific Linux (SL) is a Linux distribution produced by Fermi National Accelerator Laboratory and the European Organization for Nuclear Research (CERN). It is a free and open source operating system based on Red Hat Enterprise Linux and aims to be “as close to the commercial enterprise distribution as we can get it. Its primary purpose is to reduce duplicated effort of the labs, and to have a common install base for the various experimenters. The base SL distribution is basically Enterprise Linux, recompiled from source. This product is derived from the free and open source software made available by Red Hat, Inc., but is not produced, maintained or supported by Red Hat. Specifically, this product is built from the source code for Red Hat Enterprise Linux versions, under the terms and conditions of Red Hat Enterprise Linux’s EULA and the GNU General Public License. To download Scientific Linux 6.2 ISO file for i386 and x86_64, please visit the following FTP sites.

To download Scientific Linux 6.2 ISO file for 32 bit version
http://ftp1.scientificlinux.org/linux/scientific/6.2/i386/iso/ Mavericks iso download.

After you download an ISO image file of the installation DVD from the Red Hat Network, you can: burn it to a physical DVD (refer to Section 2.1, “Making an installation DVD” ). Transfer it to a USB device (refer to Section 2.2, “Preparing a USB flash drive as an installation source” ). Red Hat Enterprise Linux 8.1 is the most comprehensive Linux environment. It is an enterprise-level release of Red Hat Linux. This free download is the standalone DVD ISO image of RHEL 8.1 for 32-bit and 64-bit architecture.

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To download Scientific Linux 6.2 ISO file for 64 bit version
http://ftp1.scientificlinux.org/linux/scientific/6.2/x86_64/iso/

Download and Burn Scientific Linux 6.2 ISO file to DVD and make it as bootable installation DVD. After finishing it, proceed to next step for installing Scientific Linux 6. Enjoy.

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Reference :
https://www.scientificlinux.org/
http://en.wikipedia.org/wiki/Scientific_Linux