My mac book won't update catalina 10.15.5
My mac book won't update Catalina 10.15.5
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What system version are you currently running?
What happens when you try? Are you using the System/Software Update preference pane? If so and you're already running a version of Catalina try downloading and applying the macOS Catalina 10.15.5 Combo Update. It's usually easier and quicker than going thru the System Preferences app.