Over the weekend Microsoft re-released the Lync 2013 client update to the world. If you remember this is the patched which was pulled from the shelves last week due to a bug in the software update.
As part of the patch, it comprises of three updates which needs to be run in a particular order.
To install this Lync 2013 update, make sure that the following updates are installed.
Updates for Office first
and then the actual lync client update http://www.microsoft.com/en-us/download/details.aspx?id=40301
These patches come in both the 32bit and 64bit formats based on your Office client deployment.
You can find details of the downloads here http://support.microsoft.com/kb/2825630. Also you will find the KB articles which relate to the downloads.
NOTE: On installation within my lab I was finding the presence between Outlook and Lync not working as expected. At the time of writing im still evaluating if this is a actual issue. Reports are others are seeing this issue as well.