SEP Liveupdate throwing a Security error on live update

Hi,

I've recently installed SEP 12.1.1000.0157  on my macbook OS X 10.9.5. It seems i cannot do a liveupdate. I've tried several fixes mentioned in the forum and nothing worked (remove SEP reinstall it etc..). the liveupdate is throwing the error: Security error The package that LiveUpdate downloaded has expired.

I need this to run my VPN client and work.

Regards.