The binaries are updated for System Center 2012 Configuration Manager SP1, you should download them again before installing, then you will not have to install the hotfix which solves an issue with client installation.

More information:

http://blogs.technet.com/b/gladiatormsft/archive/2013/01/26/you-may-need-to-re-download-configuration-manager-2012-and-endpoint-protection-2012-sp1-binaries.aspx