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MacOS 15.4 Beta 4 was released today and I was able install via the System Settings app with success. No issues. Not sure what had gone wrong during the installation of Beta 3, however, all is well now.

Thanks for all your help. I have learned a few things from the responses to this subject. Thank You again!

Axel F.

This time my iMac has a problem installing the update, the error already comes when I want to restart.

It's in the new thread.

And the files for a downloaded updater seem not to be located in /Library/Updates. There is still nothing than that RosettaUpdater. Now I maybe can find out where it is located.

There is no full installer yet. Maybe using the one from before helps running the update. I wanted to run a full installer anyway on that iMac. I think I haven't done this since 15.0 Developer Beta 1. And then when I changed to an external boot drive maybe a 15.2 beta. But know I am on the internal drive with the old installation again. Last updates where no problem. Went even smoother on the M3 than on the M4 Pro.
 
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Am I doing something wrong or is the Terminal installer download broken?

If I remember correctly it always worked just with "softwareupdate --download 15.x" or "softwareupdate 15.x -d".
It works with the label: softwareupdate -d "macOS Sequoia 15.4.1-24E263"
 
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It works with the label: softwareupdate -d "macOS Sequoia 15.4.1-24E263"

Thanks. I think I already found it with the help command but forgot to try.

Until January or December it always worked to type the version number with one point and you got the latest release or beta from that version, when it appeared on "softwareupdate --list-full-installers".

Now it's mostly later there anyway than the direct link. Sometimes it's even in the App Store before Terminal.
 
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