It's end of life so likely not, however, call support. They can provide the link to download older versions.
SEP 11.x End of Life details:
http://www.symantec.com/docs/TECH211491
Symantec Endpoint Protection 11.x reaches EOLS on January 5, 2014, and EOSL on January 5, 2015. For further information, see the document Support life extension for Endpoint Protection 11.x and Endpoint Protection Small Business Edition 12.0.x.
Hi,
You can get that if you call the support team.
EOL For SEP
However, you need to very specific to support about why would you need this version. If you are testing/running some vendor s/w which supports only this version etc..