He showed up at the top of the roof (boston's place) if you get all the stuff you needed to be in end a. the bad news is that i still have the same issue as you do.
2 years ago since i played this game (and played it again back in 2024)... this game reminds me of my late grandma, even though i've never remember much of her back then. nice game :)
apparently end a is bugged for me. the midnight baron showed up but when i press j, it initiates boston's dialogue instead. did i miss something or did i do something wrong at the end?