What do you mean by "I've tried that"?

When you push the button, a "Browse for Folder" dialog appears asking you to pick the folder above the "Runtime" that you want to add. Are you getting the dialog? Are you picking the containing folder? Are you hitting the OK button?

And are you telling the library you want to see "" runtimes? Next to the "Show Library:" label is a pulldown. If it doesn't say "" then you told the library to only show you one - whichever it is showing next to "Show Library". If you told it to show some single specific library, then the one you just added will not be showing - it will show the one you told it to show.

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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)