Where can I find System.Web.MVC dll in a system where MVC is installed?

The default folder would be like the following:

MVC 5
C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Stack 5\Packages\Microsoft.AspNet.Mvc.5.0.0\lib\net45\System.Web.Mvc.dll

MVC 4
C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Web.Mvc.dll

MVC 3
C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll

MVC 2
C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll