10.15.2 update
Hi, I tried to install update, but for some reason, after reboot I observed the update is still available for installation and actually was not installed.
MacBook Pro 13", macOS 10.15
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Best reply
Try again but this time instead of using WiFi try a cabled connection to your router, don't use the mac while it is downloading.
Or you can download the standalone update from here, https://support.apple.com/kb/DL2028?viewlocale=en_US&locale=en_US
once downloaded double-click to install.