is Unity 4.x free ?

Hi ! I upgraded my unity 3d 3.5 up to unity 4 and i cant start it, and i have licence problem. And I think about that is not free. Am I correct ?

Unity 4 is not released and only works for those that have paid for Pro on pre-order. I would imagine that there will be a free version of Unity 4 when it is released.

It needs a profissional licence to run, so, you need to buy it.

Unity 4 has never been released, but if you pre-ordered it you would get a beta version activation. Anyone can download it, but it only works for people who pre-ordered. When Unity 4 comes out they said there will be a free version just like Unity 3.