Hm no installation other than what you did should be necessary... Did you download the 2012 Edition to match your VS2012 version?
If that doesn't work, could you just download the sources from http://teamprojectmanager.codeplex.com/SourceControl/list/changesets and run the solution directly from the code in the Editions/TeamExplorer11/Main folder? Running it in the debugger like that should probably be the easiest way to get the exception details...
Thanks!