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The macOS High Sierra 10.13.6 Update adds AirPlay 2 multiroom audio support for iTunes and improves the stability and security of your Mac. This update is recommended for all users.
AirPlay 2 for iTunes:
Control your home audio system and AirPlay 2-enabled speakers throughout your house. Play music at the same time on multiple AirPlay 2-enabled speakers in your house, all in sync. Other improvements and fixes:
Fixes an issue that may prevent Photos from recognizing AVCHD media from some cameras. Fixes an issue that may prevent Mail users from moving a message from Gmail to another account.
Offline links:
macOS High Sierra 10.13.6 Combo Update macOS High Sierra 10.13.6 Update
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