Add KB3123862, "Updated capabilities to upgrade Windows 8.1 and Windows 7"

[nlewis]

https://support.microsoft.com/en-us/kb/3123862

"The update adds capabilities to some computers that lets users easily learn about Windows 10 or start an upgrade to Windows 10."

[v998]

Optional update..

[AnrDaemon]

Doesn't matter if it is optional or not. 3035583 is also optional. Most of the time. Other times, it is pushed to mandatory, and then back to optional.
"Better be safe than sorry."

[GoToLoop]

👍

[Zurd]

3123862 should be added in the script. It is not right now.

[AnrDaemon]

@Zurd, Already in my PR.