FearLess Cheat Engine

I activate it, then a circular thing begin to turn. I go to the game, select a dwarf and unselect it. Went back to the CT and nothing. Can't click in the box anymore and redoing the process is useless, it changes nothing. Only if I completely leave the game and re-enter I can select it again, but it...

I was not able to make Last Dwarf Deselected works. I select a dwarf, then unselect it, after which I try to active the code but it does absolutely nothing.