WSUS - Forefront Client definition update not yet been downloaded

Hi! I need help about 

Definition Update for Microsoft Forefront Client Security - KB977939 (Definition 1.167.1978.0) 

I have WSUS 3 SP2 and this definition appears like approved but the file for this update  have not yet downloaded 

i downloaded the definition on Microsoft Catalog but i don't now how deploy in my clients with wsus automatically 

where save the package ? 

thanks !