There is sufficient documentation to elucidate how to obtain the list of projects in a solution. No problem here.
However, it is entirely unclear how to determine if one of these projects is an installer (such as for an Office add-in).
Furthermore, even though installer projects have a ConfigurationManager, they do not have entries among its properties such as OutputPath, which is what I ultimately am after.
If a kind soul were to give me a clue as to this mystery, I would most thankful.