Microsoft Security Bulletin(s) for APRIL 12, 2016

I have set check for updates but let me choose whether to download and install them.

I had KB3146706 not selected in the important list.
Installed the remaining selected 8 yesterday and everything seem to be fine.

Now I still have a reminder that I have new updates available, this file is the only showing up and it still unchecked.

Now I'm wondering the reason of this not selected file; should I not install this?

gobbetto said:

Now I'm wondering the reason of this not selected file; should I not install this?

Microsoft choose to uncheck it...all users have it listed that way.

There is any number of possible reasons, however DO NOT install it.

Some of those reasons could be that
it is causing issues with the OS and that was reported back to MS by some initial users that installed it.

There are reports of that one causing BSODs, so I'd avoid it at least while it remains unchecked which may indicate that it's going to be replaced or removed.