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Apple Seeds Third Beta of macOS Sierra to Developers


macrumors bot
Original poster
Apr 12, 2001

Apple today seeded the third beta of macOS Sierra, the newest operating system designed for the Mac, to developers. macOS Sierra beta 3 comes two weeks after the release of the second beta and more than a month after the software was first unveiled at Apple's 2016 Worldwide Developers Conference.

The update can be downloaded through the software update mechanism in the Mac App Store or through the Apple Developer Center.

macOS Sierra is a major update that brings Siri to the Mac for the first time, allowing users to conduct voice searches to quickly find files, look up information, and more. New Continuity features offer an "Auto Unlock" option for unlocking a Mac with an Apple Watch, which became available in beta 2, and a Universal Clipboard for copying something on one Apple device and pasting it on another.

Deeper iCloud integration makes files stored on the desktop or the Documents folder of a Mac available on all of a user's devices, and Photos features new deep learning algorithms for facial, object, and scene recognition. There's a new Memories feature for displaying photo collections, and Messages has features like rich links, bigger emoji, and "Tapback" response options.

Apple Pay is coming to the web in macOS Sierra, with payments authenticated through an iPhone or Apple Watch, and new features like multiple tabs, Picture in Picture multitasking, and optimized storage are available.

During the beta testing period, Apple will tweak and refine the features introduced in macOS Sierra. Any changes found in the third beta release will be listed below.

macOS Sierra is currently available to developers and public beta testers, and it will see a wider public release this fall. For full details on all of the new features included in macOS Sierra, make sure to check out our macOS Sierra roundup.

Article Link: Apple Seeds Third Beta of macOS Sierra to Developers


macrumors 68000
Sep 17, 2008
Why let the facts get in the way of a good story?

It is out, for realz :)


macrumors 6502
Oct 1, 2015
Behind You
It's been pretty solid for me thus far. I had some major issues early on with the screen not turning back on properly, but it turns out the issue was with a third-party kext. Ever since I removed that, I haven't had any issues. Pretty amazing for a beta OS, in all honesty.

I've been using APFS for awhile too, and have not had any issues (at least since dev beta 2). Apple has done well this time!


macrumors 68020
Feb 5, 2011
So glad I have a NAS that includes its own cloud features. I can easily see this increased iCloud integration chewing up lots of iCloud space that will require an increase in capacity and monthly subscription fees as a result. It's almost having a nickel-and-diming effect. $ for iCloud storage, then if you have Apple Music, more $, and then Netflix if you have it, etc. It can easily get quite costly every month.

Wondering when Apple will start including video as a monthly sub-based service. Maybe then they will start to offer discounted bundles. Apple Music, Apple Video, 50GB of iCloud ... $20/month. I won't hold my breath.

I'll continue to use Cloudstation with my NAS instead, and turn off these additional iCloud bits.
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macrumors regular
Jun 22, 2010
I've had VPN split-tunnel DNS issues with DP2. I hope that is fixed in this update. I know I shouldn't have installed this beta but I wanted to test out the Apple Watch unlock stuff. Other than the VPN issue i've been pretty happy with it.


macrumors 601
May 19, 2011
Update now available via App Store here in UK for me.

Oh wait I just realised. My MacBook is the only one of my products running the public beta as opposed to the developer beta. So I gotta wait for tomorrow most likely aha.


macrumors 601
Mar 30, 2004
Doh, I am now getting "This copy of iTunes is corrupted or is not installed correctly. Please reinstall iTunes. (-42037)" error.


May 20, 2015
Before the update the Recovery Update 1.0 was installed a second time and after it there is now iTunes 12.5 again.

Screen Shot 2016-07-18 at 23.25.07.png

Edit: Wrong screenshot.

Looks confusing. Installation hasn't finished yet but iTunes 12.5 is already listed as installed two times.

I had no problems with iTunes but the new/old update doesn't finish and my Mac is getting hotter and hotter and the fans are very loud. I'll better shut it down now. I have to sleep anyway.

Good night!
Last edited:


macrumors 6502
Oct 31, 2011
What is the build # for this beta? My update shows iTunes 12.5 updating but never showed beta 3 updating.
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