With the release of Windows Server 2012 and Exchange Server 2013, there were changes to the prerequisites have changed in minor ways:
Windows Server 2012 Prerequisites:
Unified Communications 4.0 (updates)
RSAT-Clustering-CmdInterface
Removal of C++ 2012
Windows Server 2008 R2 Prerequisites:
Unified Communications 4.0 (updates)
With these changes I’ve need to update the script I originally created to handle the previews of Exchange Server 2013 and Windows Server 2012. You can download this script here.