User Interface Kit

Ok, so I bought the kit and I’m now trying to figure out how to use it in my project.
Is there any chance we get the promised tutorial? I mean a simple walkl through would be nice already: Here is how you create a window with buttons, here is how you do drag and drop, here is how to use the minimaps. The project included is obviously it’s own design and the way things are done there aren’t how other’s will do it. i wasn’t even able to find an example of how the sample spellbook window is made, there are merely elements that make up the window, but how are they all put together?

A tutorial, even if only with texts would be appreciated