KB4093112 install (Win10 1709 Update)

Attempts to silently install kb patch for Win10 cumulative update to 1709 (Apr 2018). Script makes a few checks first. Script first will check that the patch is not already installed, that the system has the meltdown reg key and that the build number is less than 16299.371. Once these checks are verified the patch (about 680MB) is downloaded directly from Microsoft and then applied. Multiple restarts (suppressed by the script) may be required for the patch to finish applying. Can report using $KBinstall$ and $KB4093112$.