How to debug into the Decision Architect add-in?

Install the add-in (can be an older version) using setup.exe and Decision Architect.msi. Confirm the add-in is registered by opening Enterprise Architect and seeing the Decision Architect choice in the Extensions menu. Close Enterprise Architect and rebuild the add-in in Visual Studio. This will register your debug COM component in the Windows Registry instead of the deployed one in the SEARCH Group folder. Debug into the add-in using Visual Studio configured as described in How to start developing for Decision Architect?.