In order to support TFS 2012, we had to make our synchronization engine work with Team Explorer 2012 assemblies instead of the 2010 assemblies. You can get the Team Explorer 2012 install files from the following link - http://www.microsoft.com/en-us/download/details.aspx?id=30656
Please note that the 2012 version of Team Explorer is fully backwards compatible with previous versions of TFS. We apologize for any confusion or issues this change has caused. We are planning on improving our installer in the future to include the required TFS assemblies and we are just waiting on Microsoft to provide us with an installer module which has not been released yet.
the Telerik team