Why do you only get a free TRIAL and not the whole thing for free of newblue fx

Companies expect you to pay for their products because they put a lot of work into developing them. The people at BlueFX need to earn enough to stay in business, pay themselves a salary, and continue to create special effects. They give you a free trial so you can see if you like their product. If you do you pay for it and get the full version; if you don't you can delete it and you have not wasted your money.