It did not work for you because Visual Studio Express edition is not supported (see system requirements
) i.e. when you installed Telerik Reporting it did not install its templates properly because of the missing VS IDE. Once you've installed VS2008 (Standard, Professional or Team System Editions), you should have repaired Telerik Reporting (from Control Panel --> Programs and Features) or re-installed it from scratch, which would take care of the proper installation.
The templates you've downloaded from a forum thread are obviously for an older version of the product i.e. 126.96.36.1994 as seen from your error message.
So, try repairing the installation or reinstalling it (all VS instances should be closed) in order to have it working as expected.
the Telerik team