Roger,
The reason that some people hide KB2852664 is that is is known to nag/trick users into installing Windows 10 (whether they want Windows 10 or not).
If you do not want to install Windows 10, then you can hide KB2852664. To do that, right click the entry for KB2852664 (in the list that is shown by Windows Update). When you right click, you will see a menu appear (near the mouse pointer). One entry in that menu will be "Hide". Left click the entry that says "Hide". You may get a popup asking you to confirm.