Double pay?

I purchased this excellent app 5 weeks ago. The latest update puts a watermark on every Plotagraph now where it didnt before. To remove it I have to pay ANOTHER $4.99. How dare you do this. This is a mighty fine way to destroy your credibility with a new customer. I. AM. NOT. IMPRESSED.

LeeMoon about PLOTAVERSE • Creative Apps Kit, v2.0.1