OS 27 Update not working

Whether your Mac is compatible with macOS 27 Golden Gate depends on its specific model.

Apple’s current compatibility list includes MacBook Air with Apple silicon from 2020 onward, MacBook Pro with Apple silicon from 2020 onward, iMac with Apple silicon from 2021 onward, Mac mini with Apple silicon from 2020 onward, Mac Studio from 2022 onward, and Mac Pro with Apple silicon from 2023 onward. Apple also lists the MacBook Neo (2026) as compatible. (Apple)

Apple has made macOS 27 Golden Gate available starting September 14, 2026. (Apple)

If macOS 27 does not appear in Software Update:

1. Restart your Mac.
2. Go to System Settings > General > Software Update and check again.
3. Make sure your Mac has an active Internet connection. If you use a VPN, temporarily disconnect it while checking for the update.

If macOS 27 still does not appear, you can check which software updates are currently being offered to your Mac.

Open Terminal and run: softwareupdate --list

You can also check which full macOS installers are currently available for your Mac:

softwareupdate --list-full-installers

If macOS 27.0 or macOS 27.0.1 appears in that list, you can download the full installer with:

softwareupdate --fetch-full-installer --full-installer-version 27.0.1

Apple states that if Terminal reports “update not found,” that version of macOS is not available for your Mac. (Apple Support)

Apple — macOS 27 Golden Gate

Apple Support — How to download and install macOS

ellie2847 wrote:

softwareupdate __list-full-installers

There is your error. Instead...

softwareupdate --list-full-installers

...your command was somewhere (maybe in some word processor) converted to:

softwareupdate __list-full-installers

...which the unforgiving Terminal doesn't understand.

At the moment I get:

softwareupdate --list-full-installers
Finding available software
Software Update found the following full installers:
* Title: macOS 27 Golden Gate, Version: 27.0.1, Size: 17955378KiB, Build: 26A434, Deferred: NO
* Title: macOS 27 Golden Gate, Version: 27.0, Size: 17969056KiB, Build: 26A428, Deferred: NO
* Title: macOS Tahoe, Version: 26.7.1, Size: 17950170KiB, Build: 25G241, Deferred: NO
* Title: macOS Tahoe, Version: 26.7, Size: 17951133KiB, Build: 25G229, Deferred: NO
* Title: macOS Tahoe, Version: 26.6.2, Size: 17953734KiB, Build: 25G83, Deferred: NO
* Title: macOS Tahoe, Version: 26.6.1, Size: 17938060KiB, Build: 25G76, Deferred: NO
* Title: macOS Tahoe, Version: 26.6, Size: 17942836KiB, Build: 25G72, Deferred: NO
* Title: macOS Tahoe, Version: 26.5.2, Size: 17875271KiB, Build: 25F84, Deferred: NO

So to download the latest macOS 27.0.1 Golden Gate installer to /Applications I must then:

softwareupdate --fetch-full-installer --full-installer-version 27.0.1

...notice that the Terminal slightly confusingly displays the download process as "installing" but you have to start the install manually. Or prepare a bootable USB installer from it:

Create a bootable installer for macOS - Apple Support

Your MacBook Pro 16" 2023 with an M2 chip is fully compatible with the newly released macOS 27 Golden Gate. If your computer is currently running macOS Tahoe 26.7 and refuses to surface or download the version 27 upgrade, the issue is almost always a temporary software glitch, heavy traffic on Apple's servers, or an active process block.

The current version of macOS is 27.0.1. Based on your post you are running an older version, so the first step is to update your Mac to the current version.

See: Update macOS on Mac - Apple Support

Here are the most common reasons and how to resolve them:

Stuck Software Update Background Process

Sometimes a hidden background process gets stuck holding onto the update service, causing System Settings to falsely claim you are up to date. 

• The Fix: Restart your Mac completely. Once it reboots, do not open System Settings right away. Instead, open the Terminal app (found via Spotlight or Applications > Utilities) and force a clean check by entering:

softwareupdate --list

• If version 27 is listed, execute the following command to download the installer app straight to your Applications directory:

softwareupdate --fetch-full-installer --full-installer-version 27.0.1

• Once downloaded, open your Applications folder and double-click Install macOS Golden Gate to run the upgrade manually

Apple Server Traffic & Local Caching

Because macOS 27 was recently released, Apple's content delivery networks can experience heavy traffic, or your Mac's local cache might be lagging.

• The Fix: Close your System Settings window completely. In the Apple menu (), select Force Quit, highlight System Settings, and shut it down. Reopen it, navigate to General > Software Update, and allow it to run a completely fresh check. 

Conflicting Network Configurations

Active Virtual Private Networks (VPNs), aggressive third-party anti-virus suites, or restricted firewall configurations can block the specific Apple handshake servers required to authenticate major OS downloads.

• The Fix: Temporarily disable any active VPNs or network security software and try checking for the update again.
• If you have a commercial VPNs, consider just eliminating it per the developer's instructions. They claim to hide your browsing activity from websites, and while that may be true those VPN providers just sell your browsing data to others.

ellie2847 wrote:

Scan finished with error: Error Domain=SUMacControllerError Code=7507 "[SUMacControllerErrorAccessRequestDenied=7507] Access request was denied" UserInfo={NSDebugDescription=[SUMacControllerErrorAccessRequestDenied=7507] Access request was denied, NSLocalizedDescription=The software update request for this process was denied as another process is currently performing an operation. Please try again later.}

Try restarting your Mac, or turning it off and then back on.

Hello again

Yes. That message is actually quite specific, and it does not mean that you have done anything wrong in Terminal.

The important part is:

“The software update request for this process was denied as another process is currently performing an operation. Please try again later.”

In other words, macOS's Software Update system is already being used by another process. Your softwareupdate --list-full-installers command tried to access the same update mechanism, and macOS refused to let the second request take control.

Apple confirms that Terminal's softwareupdate --list-full-installers is the appropriate command for finding full macOS installers available for a particular Mac. (Apple Support)

I would not start deleting files or changing system settings yet

Given what you're trying to accomplish—finding out why your M5 MacBook Air isn't seeing macOS 27 (Golden Gate)—I think we should first determine whether the Software Update process is simply still busy, rather than assuming something is broken.

The safest first step is quite simple:

1. Quit Terminal.

2. Restart the MacBook Air normally.

Don't shut it down manually or force it off; use Apple menu  → Restart.

3. After the Mac has restarted, don't immediately run the Terminal command.

Wait perhaps 5–10 minutes after you reach the desktop. This gives macOS's background Software Update processes an opportunity to finish whatever operation they were doing.

4. Then open Terminal and run only this command:

softwareupdate --list-full-installers

Don't add sudo, don't modify the command, and don't run several Software Update commands one after another.

What we're looking for

If it works, you should get something resembling:

Finding available software

Available macOS Installers:

* Title: macOS 27.x

  Version: 27.x

  Build: ...

If macOS 27 does not appear, that's useful information. It would mean we need to investigate why Apple's update service considers that installer unavailable to your particular Mac, rather than trying random Terminal commands.

If you get the same 7507 error again, stop there and paste the complete Terminal response here. Don't try to fix it by killing processes yet. The exact state of the Software Update service will determine the next step.

One other important point: Apple's current documentation explicitly says that --list-full-installers lists the macOS versions currently available for your Mac model, so this is a good diagnostic step for your situation. (Apple Support)

And because you're specifically looking for macOS 27 Golden Gate, Apple now identifies that as a supported macOS release and provides a Terminal method for downloading its full installer when it is available to the Mac. (Apple Support)

Apple: How to download and install macOS

So, for now, I would do only the restart → wait 5–10 minutes → run softwareupdate --list-full-installerssequence. Then show me exactly what it says. We can take the next step from that result rather than guessing.

And now, after being corrected by Matt Haveri, with correct '--list-full-installers' entered in terminal, Terminal has been 'finding available software' for the last 10 minutes and finally shows the following result:

Last login: Mon Oct  5 11:29:04 on ttys000

eleanora.smithadministrator@Eleanors-MacBook-Airlocal ~ % softwareupdate --list-full-installers 

Finding available software

Software Update found the following full installers:

* Title: macOS 27 Golden Gate, Version: 27.0.1, Size: 17955378KiB, Build: 26A434, Deferred: NO

* Title: macOS 27 Golden Gate, Version: 27.0, Size: 17969056KiB, Build: 26A428, Deferred: NO

* Title: macOS Tahoe, Version: 26.7.1, Size: 17950170KiB, Build: 25G241, Deferred: NO

* Title: macOS Tahoe, Version: 26.7, Size: 17951133KiB, Build: 25G229, Deferred: NO

* Title: macOS Tahoe, Version: 26.6.2, Size: 17953734KiB, Build: 25G83, Deferred: NO

* Title: macOS Tahoe, Version: 26.6.1, Size: 17938060KiB, Build: 25G76, Deferred: NO

* Title: macOS Tahoe, Version: 26.6, Size: 17942836KiB, Build: 25G72, Deferred: NO

* Title: macOS Tahoe, Version: 26.5.2, Size: 17875271KiB, Build: 25F84, Deferred: NO

eleanora.smithadministrator@Eleanors-MacBook-Airlocal ~ % 

ellie2847 wrote:

Terminator hangs at 'Scanning for 27.0.1 installer' and the result I got when using check for updates again was an incessantly rotating gear, as in 'I'm thinking....'

Be patient and give it time and make sure your Internet speed is OK. Sometimes Apple's servers might also be busy so try another day. Or sometimes it might work better in safe mode.

You once helped me to fix my problem with not finding the OS26.6.2 to update my MacBook Air M5. NOW, when I use the Terminal to list-full-installers (in order to find the OS 27. that the same MacBook Air can't find) this is what I get. And I cannot go any further because I don't know what it means '....another process is currently performing an operation...'

Last login: Sun Oct  4 19:50:02 on ttys000

eleanora.smithadministrator@Eleanors-MacBook-Airlocal ~ % 

eleanora.smithadministrator@Eleanors-MacBook-Airlocal ~ % softwareupdate --list-full-installers

Finding available software

Scan finished with error: Error Domain=SUMacControllerError Code=7507 "[SUMacControllerErrorAccessRequestDenied=7507] Access request was denied" UserInfo={NSDebugDescription=[SUMacControllerErrorAccessRequestDenied=7507] Access request was denied, NSLocalizedDescription=The software update request for this process was denied as another process is currently performing an operation. Please try again later.}

Last login: Mon Oct  5 11:19:02 on console

eleanora.smithadministrator@Eleanors-MacBook-Airlocal ~ % softwareupdate __list-full-installers

usage: softwareupdate <cmd> [<args> ...]

** Manage Updates:

-l | --list List all appropriate update labels (options:  --no-scan, --product-types)

-d | --download Download Only

-i | --install Install

<label> ... specific updates

-a | --all All appropriate updates

-R | --restart Automatically restart (or shut down) if required to complete installation.

-r | --recommended Only recommended updates

    --os-only Only OS updates

    --safari-only Only Safari updates

    --stdinpass Password to authenticate as an owner. Apple Silicon only.

    --user Local username to authenticate as an owner. Apple Silicon only.

--list-full-installers List the available macOS Installers

--fetch-full-installer Install the latest recommended macOS Installer

--full-installer-version The version of macOS to install. Ex: --full-installer-version 10.15

--install-rosetta Install Rosetta 2

--background Trigger a background scan and update operation

** Other Tools:

--dump-state Log the internal state of the SU daemon to /var/log/install.log

--evaluate-products Evaluate a list of product keys specified by the --products option 

--history Show the install history.  By default, only displays updates installed by softwareupdate.  

** Options:

--no-scan Do not scan when listing or installing updates (use available updates previously scanned)

--product-types <type> Limit a scan to a particular product type only - ignoring all others

Ex:  --product-types macOS  || --product-types macOS,Safari 

--products A comma-separated (no spaces) list of product keys to operate on. 

--force Force an operation to complete.  Use with --background to trigger a background scan regardless of "Automatically check" pref 

--agree-to-license Agree to the software license agreement without user interaction.

--verbose Enable verbose output

--help Print this help

Before I ever got any response returned to the command to list-full-installers, the result I got when using check for updates was an incessantly rotating gear, as in 'I'm thinking....'

So, I now tried Terminator again and entered: softwareupdate --fetch-full-installer --full-installer-version 27.0.1

However, Terminator hangs at 'Scanning for 27.0.1 installer' and the result I got when using check for updates again was an incessantly rotating gear, as in 'I'm thinking....'