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macOS Catalina 10.15.4 won't be installed on my Mac.

I think it took several hours to down load it but it takes several seconds to install it on my Mac.

Whenever Apple logo and progress bar are shown, it just take several seconds for the progress bar to complete. After finishing progress bar, my Mac reboots and shows windows which tell me there are an available update macOS Catalina 10.15.4.

I have no idea why it won't be installed on my Mac.


MacBook Pro 15", macOS 10.15

Posted on Mar 28, 2020 8:14 PM

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Posted on Mar 29, 2020 5:54 AM

Verify what macOS you currently have installed

>About this mac


If you are running the 10.15.3 and need to update to the 10.15.4 you can download directly the

Combo update macOS 10.15.4 https://support.apple.com/kb/DL2037?locale=en_US



If you still have an issue installing this combo, reboot into SafeBoot Mode— then launch the combo installer from this environment.


SafeBoot https://support.apple.com/en-us/HT201262

Takes noticeable longer to get to the login screen, does a 5-15 minute disk repair before it fully boots up, and certain system caches get cleared and rebuilt, including dynamic loader cache, etc. Login to proceed.

35 replies

macOS Catalina 10.15.4 won't be installed on my Mac.

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