Sony Vegas Pro 21.0.0 Build 108

I use this program only works on a 64-bit system.For dummies it is too heavy.First, learn how to Pinnacle or Corel video.Yayu use recently but found one flaw with this program.After rendering the video file becomes more contrast and darker and can not find the cause.I searched for an answer on the entire internet but did not find.And this problem for many.If anyone knows the cause please leave your comments.

Terrible program !!! Impossible to work because it is very stupid! And it's very hard to figure out!

I do not understand the program is good?

THE NONSENSE DOWNLOADED BUT DOES NOT OPEN REQUIRES A KEY AND IT IS NOWHERE TO BE FOUND!!!!!!!!!!!!!

Why does it say impossible when I want to install it??? I have Windows 7