For those who may be wandering what happened to the Free version of Wise Tasks, here is a short explanation:
The choice of having two separate apps (free and paid) was a bad one, given the time it takes to maintain and improve two code bases (which are similar, but still different).
The free version has been lagging behind for several weeks now, and many critical bug fixes were still lacking. For that reason it was getting lots of negative reviews.
The free version was then removed so that more energy could be focused on creating the new WiseTasks for BlackBerry 10, and maintaining the current paid version. We will look into a better model to allow users to try WiseTasks for free in future versions.
Sorry for the inconvenience.