KB3074674

In case you are already running Windows 10 on your PC, you may like to check for the latest security update that Microsoft has pushed. The security update KB3074674 not only fixes a vulnerability in Windows that could allow elevation of privilege if the Windows Installer service incorrectly runs custom action scripts, but also brings some changes to “enhance the functionality of Windows 10 through new features and improvements”.

KB3074674 changelog:

This security update resolves a vulnerability in Windows that could allow elevation of privilege if the Windows Installer service incorrectly runs custom action scripts.Additionally, this update includes non-security-related changes to enhance the functionality of Windows 10 through new features and improvements.
This update is available through Windows Update. When you turn on automatic updating, this update will be downloaded and installed automatically. For more information about how to turn on automatic updating, see Get security updates automatically.

Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.