Anyone been able to grab the security update package for 11.5.1 both arm and intel.
Otherwise what is the package name look like when you run a softwareupdate -l then I can build a script to check if peoples machines are seeing it.
Mr. Macintosh's web site tracks all of the Big Sur Install Assistant packages: https://mrmacintosh.com/macos-big-sur-full-installer-database-download-directly-from-apple/
I've written a script that pulls down the exact installer from Apple directly, downloads it to the Applications folder, installs it, and then moves it to the trash bin. Yes it's a bit excessive but it has worked so far, in my environment I don't have any M1 Macs yet. Below is the script:
sudo softwareupdate --fetch-full-installer --full-installer-version 11.5.1
There's probably an easier method but this is what I've tested so far and know it works.