There are many reasons to change a major Version release number. First of all it goes into another folder. Many have V4 and V5 installed at the same time. There were also major GUI changes and changes to key code system, which ferrets out users of cracked programs. They cant get a valid V5 key unless they have a valid V4 key. Sometime measures have to be taken that the average consumer is not aware of. All this makes the program better in the long run. May8th is almost upon us, if anyone does not own this program now, try it and if you like it buy it. May8th the prices will be changing.