I try to play now and holy shait is this scuffed. How do you even get to see those scenes? Because it feels genuinely impossible. Is there some sort of watch mode or something? Or you just look for rule 34 videos and pray that some of them feature characters you want to see?
Mugen does have a watch mode. But each character has their own moveset that triggers their scenes. Usually, they have a moveset note file in their folder or in the description part of the website page you downloaded them from, that lists their movesets and their activation conditions.
By the way, do you still happen to have this version:
Not sure if this is a new one, but here.
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Could be my pc only, but the least you can do is look for your characters there. Startup's wonky.
Edit: The new one.
aHR0cHM6Ly9kcml2ZS5nb29nbGUuY29tL2ZpbGUvZC8xX0stakV2RnFhMl9MOGk3SXVWN1owbzJaQjg3YzlrNzEvdmlldw==
I didn't download it in time, and now the file seems gone. I would really appreciate it if you, or anyone else, could send the link again.