I am jumping on the bandwaggon here too. I Too bought this almost 4 years ago after using the free version before then for some time.
Since I bought this I have received all the updates free without having to buy it again as part of a subscription, you HAVE clearly changed your model and practices. We are aware that you changed the software to include the update of some programs, but very little on the surface has changed. It is like someone has drawn a line in the sand and said well we know you have been having all these updates etc well now we want more money, I am guessing this pop up we are now getting was included in the last update?