I am trying to compile a project in visual basic into an Arc map add on. I am receiving two warnings that are preventing the build from completing. Both errors entail that the assembly ESRI.ArcGIS.Desktop.AddIns could not be found. I received this project and source code by request from someone else. From other responses on here to similar issues in compiling in Visual Basic I have made sure that the Register for COM interop is unchecked in the compile tab of the project properties and I have made sure the Copy Local and Specific Version in the References tab is set to false.
When I searched through my computer I was not able to find the ESRI.ArcGIS.Desktop.AddIns assembly in order browse and assign a reference path in Visual Basic. It seems the it is not on my computer. I have not had any experience with an assembly before, so my question is how do I get access to this ESRI.ArcGIS.Desktop.AddIns assembly?