You have downloaded the ASP.NET AJAX Control Toolkit v20.1.0 nuget package. To learn more about this release, please read this post: https://www.devexpress.com/ajaxtoolkitinfo Getting Started --------------- Please see https://www.devexpress.com/go/AjaxControlToolkit_Nuget_TextFile.aspx for more information on using the ASP.NET AJAX Control Toolkit. Upgrading from earlier version ------------------------------ Please see https://github.com/DevExpress/AjaxControlToolkit/wiki/Upgrading-from-v7.x-and-below for more information on how to upgrade from v7.x version or below. Maintained by DevExpress ------------------------ The ASP.NET AJAX Control Toolkit is now maintained by DevExpress. Visit http://devexpress.com/ms-act for more information.