The same problem here... or quite similar at least. I wanted to upgrade from version 3 (second time, I'm using since v2). Everywhere I can found information that Fences 4 costs $9,99 but now I see on stardock.com $19,99 (upgrade should be, as I can see, 50%).
It seems like 100% price increase!
Now you want me to pay for new version the same amount as for new licence. Please fix it!