Download ISO file of CentOS 6.10 for installation from the following site. It's OK to download the 64 bit version commonly. But if your computer is old and it's not supported 64 bit computing, download the 32 bit version from below. 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.

From CentOS Project:

CentOS developers use Red Hat's source code to create a final product very similar to Red Hat Enterprise Linux. Red Hat's branding and logos are changed because Red Hat does not allow them to be redistributed. CentOS is an Enterprise-class Linux Distribution derived from sources freely provided to the public by a prominent North American Enterprise Linux vendor. CentOS conforms fully to the upstream vendors redistribution policy and aims to be 100% binary compatible. CentOS is developed by a small but growing team of core developers. In turn the core developers are supported by an active user community including system administrators, network administrators, enterprise users, managers, core Linux contributors, and Linux enthusiasts from around the world.

What do you need to know about free software?

Centos 6 32 Bit Iso File Download

From CentOS Project:

What do you need to know about free software?

Centos 6 32 Bit Iso File Download

Centos 6 Iso Free Download 32 Bit

Centos 6 Download 32 Bit