Hello,
I don't think Symantec Endpoint Protection 11.x (Test version) is available on net.
You could still Find and Contact a Symantec Partner / Accounts Manager / Reseller from whom you can grab a copy, check the link below:
Why not Test Symantec Endpoint Protection 12.1?
https://www4.symantec.com/Vrt/offer?a_id=117194
Hope that helps!!