Our development team further investigated the issue and it proved to be an error in the build scripts for the installer. It is expected to be fixed for the official release that's coming out very soon - around the middle of October. Meanwhile, please, open the
file that should be looked under:
Program Files\Common Files\Microsoft Shared\Web Server Extensions\15\ISAPI\Telerik.Ajax.SharePoint
and change its version number to the version number of the Telerik.Ajax.SharePoint.dll that's in your GAC.
It should be: 2013.2.717.45
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