title: How to upgrade Ajax Control Toolkit to the latest version only to a particular solution
body: <p>I am planning to upgrade Ajax Control Toolkit (ACT) from version 4.x to the latest 15.x. I have several Visual Studio solutions running on the same computer, and I want to upgrade only for some solutions and keep the others running the existing older versions. Initially I thought of using the DevExpress's installer for the latest ACT at <a href="https://ajaxcontroltoolkit.codeplex.com/releases/view/618129" rel="nofollow">https://ajaxcontroltoolkit.codeplex.com/releases/view/618129</a> . But the problem is that it is an .exe installer and per the documentation it will install on all the Visual Studio solutions/projects. I saw another option of using nuget's package manager at <a href="https://www.nuget.org/packages/AjaxControlToolkit/" rel="nofollow">https://www.nuget.org/packages/AjaxControlToolkit/</a> using the command PM> install-package AjaxControlToolKit. I am not sure whether this will also install on all projects or only the project opened on which I ran the command. If there is a better safe way of upgrading the ACT, I would like to know also, such as copy/paste/replace the older dll with newer one.</p>
  
  <p>Thanks</p>