I know KB2919355 is a mandatory update for all Win 8.1 users. What I want to know is..... how come I get to install it twice ? First I installed it was on Aril 3rd when I installed 5 Win 8.1.1 updates. Yesterday, It showed up on my Windows Update notification. So, I installed it again. Note :There is a slight difference in the name of the same KB.