The MacOS Sierra 10.12.6 Update improves the security, stability, and compatibility of your Mac, and is recommended for all users.

Enterprise content:

• Resolves an issue that prevents making certain SMB connections from the Finder.
• Fixes an issue that causes Xsan clients to unexpectedly restart when moving a file within a relation point on a Quantum StorNext File System.
• Improves the stability of Terminal app.

See Apple Security Updates for detailed information about the security content of this update.

For more about The Update you can also visit the official link of apple

How You Can Update Your Mac Information By Apple

he Mac App Store shows updates for Mac, not updates for iPhone, iPad, or iPod touch. If you don’t have the App Store on your Mac, get updates by choosing Software Update from the Apple () menu.

If you don’t see an expected Mac update:

• Install any updates that are available, then check for updates again. Some updates appear only after installing other updates, and some updates are part of other updates. For example, updates for Safari don’t appear, because you get them as part of macOS updates.
• Use the Search field in the toolbar to search for the app that you want to update.
• Click Purchased in the toolbar to see which apps you got from Mac App Store. If you got an app from somewhere else, check with the maker of the app for updates.
• If you’re using OS X Snow Leopard or Lion, get OS X updates by choosing Software Update from the Apple menu. Get app updates from the Mac App Store.

How To Download Updates Manually on Your Mac

1. Just visit this Link 
2. Select Your Country
3. Just Download Any Update you like