Thanks to a quirk in the support lifecycle, Windows 8 users are about to be cut off from security updates. When the first Patch Tuesday of 2016 rolls around on January 12, it will represent the last batch of updates for Windows 8.
If you're still running Windows 8, it's time to update to Windows 8.1 or Windows 10 or risk exposing your PC to unpatched security risks.
http://www.zdnet.com/article/still-running-windows-8-time-to-upgrade-or-else/?tag=nl.e539&s_cid=e539&ttag=e539&ftag=TRE17cfd61