ValidationEngine
used by jTable in your sample is different from jQuery.Validation
.
The 1st one is made buy Cedric Dugas and available on GitHub and you can download all the elements you need (js file, css file, language files) here: https://github.com/posabsolute/jQuery-Validation-Engine.
The 2nd one, "jQuery Validation", is a jQuery plugin made by Jörn Zaefferer (more info here: http://plugins.jquery.com/validation/), and is available directly as a package through NuGet when you are using Visual Studio.