PopDrop Menu is a simple animated burger stack that contains a PopDrop dropdown. You can use it to create many types of dropdown content, dropdown menus, mega menus and navigation elements.
All you need to do is to update PopDrop to version 1.1.0 (or download it for free if you don’t have it) to get the new Menu stack.
If it updated to v1.1.0 then you must have had the menu stack - it is contained inside the main stack so you cannot have one without the other. It was most likely that RW just needed a restart/