You are the first one to catch and report this. We'll see what approach to take to fix this particular game.
Just open RPG game and manually edit 2 lines in the Actor behavior called Dialog Box Core. It's in code mode. Save and retest game.
******************************************************************************
Line 127
FROM
override public function update():void
TO
public function update(list:Array):void
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Line 546
FROM
override public function draw(g:Graphics, x:Number, y:Number):void
TO
public function draw(list:Array, g:Graphics, x:Number, y:Number):void