Unable to install macOS Sequoia update 15.4 on my MacBook Pro

Just updated to 15.4.1 and it worked!

If 15.4 didn’t work for you, give this one a try.

That's great to hear! 😄

There will be many folk who have been posting and reading in this thread who will be very pleased!

You might want to try clearing out any leftover update files and resetting the software update settings, those steps can sometimes fix weird issues where macOS updates fail without a clear error. There's a guide that walks through those and a few other things worth checking: Fix macOS Sequoia Not Installing on Your Mac

Wow! It did help to solve my issue. Mac started to download 6,17 GB update, during installation it restarted 5-7 times and now I'm on macOs 15.4!

The only thing I needed to change is the terminal command to download eaxctly 15.4 version:

softwareupdate --fetch-full-installer --full-installer-version 15.4

But I needed to wait till the download completes, go to Applications folder and launch the installer manually.

I think I could have just adjusted your command to

sudo softwareupdate --fetch-full-installer-version 15.4 -a --launch-installer -R

Do not Update to 15.4 - this will fail for ever regardless what method you choose. Update specifically to 15.4.1, which was an "emergency"-update to fix this problem on M1 MacBook Pros. Or go to 15.5 anyway, which is the most recent version - no trouble there.

Good luck!

A possible solution for those who have encountered a problem similar to mine.

I was unable to install a clean 15.4 system from a bootable USB stick. After installation, the computer asked to reinstall the system again.

I had to install macos Sonoma (14.7.5). From sonoma, I also could not install the sequoia version 15.4.

I also tried to download version 15.2 and install it - the result is also unsuccessful.

The solution that worked for me:

1. Boot into safe mode - this may not be necessary, but it is not at all difficult.

2. Download the full installation version 15.3.2:

sudo softwareupdate --fetch-full-installer --full-installer-version 15.3.2

3. Install it. I was able to install it by running the installer from Sonoma and via a bootable USB flash drive.

I will not install the 15.4 update for now. I have spent a lot of time, I do not want to anymore. I will wait until the company fixes the problems.

Try this. I was in the same situation with my M1 Pro and I was able to restore it from a Mac Mini M2. Mini I was able to upgrade it to 15.4. Now all good with M1 Pro. It has 15.4 and works perfectly.

How to revive or restore Mac firmware - Apple Support

So I was able to perform the DFU restore of the M1 from my new M4 running 15.4. Followed the Apple instructions and it did the whole thing in about 20 minutes. Thanks all.

I was having the same problem, but Apple has released MacOS Sequoia 15.4.1 and it installed perfectly on my M1 MacBook Pro. It worked for me, maybe it'll work for you too. Hope that helps.

How much free space on your system drive?

I've experienced the same error yesterday and I've tried the command this morning. Here's the result

softwareupdate --fetch-full-installer --full-installer-version 15.4

Scanning for 15.4 installer
Install failed with error: An error occurred while running scripts from the package “InstallAssistant.pkg”.
Error Domain=PKInstallErrorDomain Code=112 "An error occurred while running scripts from the package “InstallAssistant.pkg”." UserInfo={SUErrorUpdateTitle=macOS Sequoia, NSURL=file:///Library/Updates/082-16524/InstallAssistant.pkg, PKInstallPackageIdentifier=com.apple.pkg.InstallAssistant.macOSSequoia, NSLocalizedDescription=An error occurred while running scripts from the package “InstallAssistant.pkg”., SUErrorRelatedCode=SUErrorCodeInstallFailure, NSFilePath=./postinstall.sh, SUErrorUpdateProductKey=082-16524}

This morning, I contacted Apple Support to continue troubleshooting after backing up my important documents. I explained the steps I had taken and shared insights I found online from the apple forum. They informed me that I would need access to another Sequoia Mac in order to attempt further recovery methods. Unfortunately, my only remaining option would be to wipe and reinstall, although they cautioned that this might not resolve the issue, as the M-series chips don’t allow downgrades.

As an alternative, they recommended scheduling a Genius Bar appointment, where they would have the necessary tools to explore additional recovery options before resorting to a clean install. I’m heading in this afternoon to see if any progress can be made before taking that final step.

Yes, Apple just release 15.4.1 and it worked. I just test it on my MacBook and it worked.

Update successfully completed.

I have the same problem with my M1 MacBook Pro

Apple have now addressed the problem, as of 16/04/25 released 15.4.1 which corrects the installation issue

Just updated to 15.4.1 and it worked!

If 15.4 didn’t work for you, give this one a try.

15.4.1 Fixed this issue for me. Good luck everyone!