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Apple Computing Products:
macOS - Operating System
Creating a Bootable Installer for MacOS
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<blockquote data-quote="MacInWin" data-source="post: 1813671" data-attributes="member: 396914"><p>Yes, if you are booted from a newer version the installer application won't run against the boot drive. But if you are booted from an external, no matter what is on the internal, it can be replaced by an older version. If the internal has been converted to APFS, it will require repartitioning back to HFS+ to do that, but it can be done.</p></blockquote><p></p>
[QUOTE="MacInWin, post: 1813671, member: 396914"] Yes, if you are booted from a newer version the installer application won't run against the boot drive. But if you are booted from an external, no matter what is on the internal, it can be replaced by an older version. If the internal has been converted to APFS, it will require repartitioning back to HFS+ to do that, but it can be done. [/QUOTE]
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Apple Computing Products:
macOS - Operating System
Creating a Bootable Installer for MacOS
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