You will need to have the following pre-requisites installed:
MSO (KB2727096), MSORES (KB2817624), IDCRL (KB2817626), and Lynchelp (KB2817678). These have likely been previously installed.
Client | Version | KB | Download |
Lync 2013 Client 32-bit | 15.0.4605.1003 | ||
Lync 2013 Client 64-bit | 15.0.4605.1003 |