Seit dem “April 2014 CU” für SharePoint 2013 müssen nicht mehr nur eine, sondern insgesamt drei Dateien heruntergeladen und in das gleiche Verzeichnis entpackt werden:

Please note the following change for new releases. Previous releases of the SharePoint Server 2013 cumulative update included both the executable and the .CAB file in the same self-extracting executable download. Based on the file size, the SharePoint Server 2013 package has been now divided into several separate downloads. One contains the executable file (identified as i´.e. ubersrv2013kbxxxxxfullfilex64glb), while the other contains the .CAB file (identified as i.e. ubersrv1,…2 etc.). All of them are necessary and must be extracted to the same folder to successfully install the update. All of them are available by clicking the Download link in the KB article for the release.