Info/Downloads of macOS 10.13.6, Security Update 2018-004 for El Capitan and Sierra, Safari 11.1
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macOS High Sierra 10.13.6, Security Update 2018-004 for Sierra & El Capitan, Safari 11.1.2
Available via software update and download pages below. Here's info on the macOS 10.13.6 update (build 17G65) from the release notes:
"About the macOS High Sierra 10.13.6 Update
This update is recommended for all macOS High Sierra users.

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.
(See below for iTunes 12.8 update.)

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.

(See below for article on security fixes in this update.)

Docs on security fixes in 10.13.6, Security Update 2018-004 Sierra/El Capitan, Safari 11.1.2 below.

Download pages for macOS 10.13.6 & Security Update 2018-004 updates:

Related Apple Articles:

If you're running Security/AV software on your Mac, it may interfere with updates. Of course backup your current boot drive before updating. (And a bootable clone is a plus.)

FYI on Nvidia Web Driver Updates:
Users of Nvidia's web drivers should know that new OS updates (versions or later build numbers after Security Updates) break any currently installed Nvidia web graphics driver. I'd switch to the default Apple driver and reboot before updating, if your card is supported with the default drivers. If not, wait for a Nvidia driver update. (Some non-Mac EFI cards are not supported by default OS X drivers.)
Of course have a current backup (and if possible, a Clone) of your boot drive before any update. (As usual, I'll post download pages for Nvidia updates when spotted in the news and video topics page.)

Nvidia Web Graphics Drivers Updates:
On July 10th and 11th Nvidia posted driver updates for macOS 10.13.6 and new builds of 10.12.6/10.11.6 after installing Security Update 2018-004.
 

iTunes 12.8, iOS 11.4.1, tvOS 11.4.1, watchOS 4.3.2:


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