I dowloaded the game ı registred I waited the full game but its so slow ı left 6 hour open but it was 20% and my pc is 1 terebayt what is going on with this launcher

I don't there's anything wrong with the client. I started around 10 mins ago and its already at 70%. It may a problem with your internet.

Mine finished downloading in like 25 min.

Your Connection Speed has some problems i think.
It depends where you are, if you are in America or near America, should take less than 20 to 30 minutes.