如何将Ajax Control Toolkit仅升级到特定解决方案的最新版本

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 I am planning to upgrade Ajax Control Toolkit (