When your Mac says "the macOS installation couldn't be completed", it could mean: What does macOS installation couldn't be completed mean? Why does your Mac say "macOS installation couldn't be completed"? And how to stop the error and complete the macOS installation. I clicked it again, but this time said 'The macOS installation couldn't be completed'." It seemed to go through fine, but after restarting it was still offering me the update in the App Store. "I'm installing the 10.13.6 supplemental update on my 2018 MacBook Pro. When trying to update macOS, some users ended up encountering the error: the macOS installation couldn't be completed.
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