[http://1.gravatar.com/blavatar/f99f85959d77522599104acafa8430c7?s=200]
Lync 2013 CU4, CU5 Update installer – Windows Fabric Error 1603
Recently the client I’m working on required their Lync 2013 environment to be patched up to date, which usually is not a problem however the support guy doing the patching soon ran against an issue…

http://northernlync.wordpress.com/2014/10/14/lync-2013-cu4-cu5-update-installer-windows-fabric-error-1603/