hdiutil attach /tmp/BigSur.dmg -noverify -mountpoint /Volumes/BigSur

The standard procedure was tedious. Elias initiated the softwareupdate command in the terminal to fetch the 'InstallAssistant.pkg'. The progress bar crawled. This was the raw data, the installer application wrapped in a package. It wasn't an ISO yet—not the bootable disk image he needed to mount on the server's remote virtualization software.

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