Hi,
For downloading .jdb file..
http://www.symantec.com/security_response/definitions/download/detail.jsp?gid=sep
How to update using .jdb file..
http://www.symantec.com/business/support/index?page=content&id=TECH102607&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D141058510275024ASXHUB5bgLBtSXkZ52DThl597e3ID3NO6Sn
Regards,
Malli.