To add any 3rd party .dll to an installer,
- make sure the .dll is added to the project, Right-click My Computer in the Project Explorer Window and click Add > File.
- Create an exe Build Specification by right-clicking Build Specifications on the Project Explorer Window and clicking New > Application(EXE).
- Select the DLL file as Always Included under the Source Files Tab.
- After building the application, right click Build Specifications >> New >> Installer to create the installer.
- The DLL should appear as part of the Application under the Source Files tab.
- Build Installer.
The Installer should install all files that are included as part of the application.