Quote:It's the second Tuesday of the month, and that means every supported version of Windows is getting a slew of cumulative updates, mostly focused on security. Naturally, that includes recent versions of Windows 10, but also Windows 8.1 and, if you're paying for it, WIndows 7. As usual, there are two updates for each operating system, a montly rollup and a security-only update.
 
For Windows 8.1, the monthly rollup is KB4550961, and you can download it manually here. Here's what's new in this update:

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• Security updates to Internet Explorer, the Microsoft Scripting Engine, Windows Kernel, Windows App Platform and Frameworks, Microsoft Graphics Component, Windows Media, Windows Fundamentals, Windows Core Networking, and the Microsoft JET Database Engine.
  

The security-only update for Windows 8.1 is KB4550970, and it can be downloaded manually from here. Unlike the monthly rollup, this one won't be available through Windows Update, so you have to download it manually if you want it. The changes are nearly identical, except the security updates to Internet Explorer and Microsoft Scripting Engine aren't included.