Update Anti Virus on unmanage SEP Client 11.0.7

Good Day All,

I will like to seek ideas on how to update Anti Virus Defination for legacy product SEP 11.0.7 

I am on Window2K and on a unmanage SEP11.0.7. There for i am amble to update via SEPM.  

I am also unable to upgrade my system.

In addition, can the current anti virus defination still work on unmanage 11.0.7 SEP client?