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MacBook Pro, Catalina 10.15.4, won't download, automatically or manually, the most current security update. The updater (update tool...?) shows an update so I select "now" and "restart." System restarts. The update window is still open and no update has been installed. I'm guessing the update tool is corrupt...? Is this something a novice can diagnose and repair on their own? Thank you.
Try this direct download link: Download macOS Catalina 10.15.7 Combo Update
Try this direct download link: Download macOS Catalina 10.15.7 Combo Update
MacBook Pro Catalina 10.15.4 won't update current security update.
