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I have restarted my computer three times to "Update Now". The MacAir restarts but does not start the update. Maybe it will work tonight? Not a huge deal if it successfully updates on its own, but it is frustrating that Apple released an instruction that does not work.
Try this standalone "Combo" update: Download macOS Catalina 10.15.4 Combo Update
Try this standalone "Combo" update: Download macOS Catalina 10.15.4 Combo Update
Catalina 10.15.4
