What's New In This Version:
The macOS Sierra 10.12.5 update improves the security, stability and compatibility of your Mac.
• Fixes an issue where audio may stutter when played through USB headphones
• Enhances compatibility of the Mac App Store with future software updates
• Adds support for media-free installation of Windows 10 Creators Update using Boot Camp
You can download macOS Sierra from the App Store for free.