To enable this Lync 2013 security update, make sure that the following updates are installed:
MSO
May 12, 2015, update for Office 2013 (KB3039700)
LYNCHELPLOC
April 14, 2015, update for Lync 2013 (Skype for Business) (KB2889853)
Office 2013 SP1
Microsoft Office 2013 Service Pack 1 (KB2817430)
Office 2013 Language Pack SP1
Office 2013 Language Pack Service Pack 1 (KB2817427)