Sorry, Yazsoft, but THIS is the worst decision you EVER made.
I bought V2.0. I bought an Update to V4.0 and I got the MacHeist bundle (yes, now I own two licenses). But I won't pay another 15 bucks for an upgrade which you present a few days after selling thousands of copies of version 4. This is a behavior I can't understand. Yes the MH bundle was cheap - but now it's you who shout something like "Haha! You haven't got the actual version. Pay us some more money to get it!" to several thousand buyers of this bundle.

And, by the way beside the politics: Version 4 is running fine - this version has everything I need and so there's no reason to give you additional 15 Dollars (not for one and not for two licenses).