Mohan,
UCS Central software can be downloaded at the below link.
https://software.cisco.com/download/release.html?mdfid=284308174&flowid=36822&softwareid=284308194&release=1.3(1b)&relind=AVAILABLE&rellifecycle=&reltype=latest
UCS Central install guides can be found at the below link.
http://www.cisco.com/c/en/us/support/servers-unified-computing/ucs-central-software/products-installation-guides-list.html
