Yes well we all don't know what we don't know.

We didn't know the installer could claim to be successful while actually not being successful.

The installer web page does say you must uninstall previous versions first. I'm guessing that if you fail to do so, the installer just goes ahead and does nothing, without checking. I suppose that's why they tell you in the instructions to uninstall first - because the installer doesn't.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)