It may not be what you want to hear
but the visual editor was a stand alone product separate from AppGameKit studio which has many more features than just an editor
Im sorry it seems to have stopped development but im sure you will find the development was outsourced and not the development
of TGC developers. The marketing may have offered them together as a bundle but I cant see you getting discount on a product
that was developed with the choice of two rendering engines that just happens to have an editor built in. AppGameKit studio was
developed separately and TGC offered substantial discounts for those that ordered during its development, if you missed out
on one of these you may have to wait sometime to see discounts like that again. Apart from both having an editor it doesn't mean
the code was reused in Studio due to outsourcing and beyond TGC's control
Apologies that you bought a product you are not happy with, but I don't think you will get the discounts/refunds you seek