This version is old school.
Please find jQuery plugins on npm.
Better Unobtrusive Ajax (not only for ASP.NET MVC)
Unobtrusive AJAX library done right. 100% compatible with 'Microsofts Unobtrusive Ajax support library for jQuery' found in ASP.NET MVC3 and MVC4 without bugs, with new features, clean and well documented, compatible with latest jQuery. But also fully usable without ASP.NET MVC