Windows Server 2012 is the server version of Windows 8 and the successor to Windows Server 2008 R2. Windows Server 2012 is the first version of Windows Server to have no support for Itanium-based computers since Windows NT 4.0. Windows Server 2012, now in its second release (Windows Server 2012 Release 2) includes Foundation, Essentials, Standard and Datacenter, and does not support IA-32 or IA-64 processors.
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in the registry, you can find it in HKLM\Software\Microsoft\Up
However, do NOT manually cleanup the content folder by deleting things manually.
Go to options -> server cleanup wizard in the wsus console else you could have database issues if you try to delete files manually