What's New In This Version:
The macOS Sierra 10.12.3 update improves the stability and security of your Mac.
• Improves automatic graphics switching on MacBook Pro (15-inch, October 2016)
• Resolves graphics issues while encoding Adobe Premiere Pro projects on MacBook Pro with Touch Bar (13- and 15-inch, October 2016)
• Fixes an issue that prevented the searching of scanned PDF documents in Preview
You can download macOS Sierra from the App Store for free.