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Update #11.2.3 to BIG SUR fails to install after downloading

What procedure or suggestion to address the subject issue?

iMac 21.5″ 4K, macOS 11.1

Posted on Mar 12, 2021 10:02 AM

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Question marked as Top-ranking reply

Posted on Mar 14, 2021 3:27 AM

Suggest - restart Router and then Shutdown Computer and connect via Ethernet connection. Restart computer in Safe Mode - Shift - Key immediately at startup. It does a Repair Disk, clears cache files and load only Apple Software - load slowly - Normal. Once in Open Apple Apps Store and find Big Sur and download. Try not to let computer go to sleep mode or Screen Save to activate. Be patient as one knows it Big Sur is 12.18 GB size. There are often periods where it seems to pause the download , normal be patient as countdown clock may say 15 minutes but in Real Time could be 30 - 45 minutes. This can and will happen several time in the process. If all goes well. it will successfully download and attempt to Launch. Do NOT allow it to start - Quit the Installer. Check Applications Folder for new App called Install Bug Sur. Make a copy to External Drive - future usage. Now, restart again in Safe Mode - then launch the Installer.

8 replies
Question marked as Top-ranking reply

Mar 14, 2021 3:27 AM in response to George Valdez

Suggest - restart Router and then Shutdown Computer and connect via Ethernet connection. Restart computer in Safe Mode - Shift - Key immediately at startup. It does a Repair Disk, clears cache files and load only Apple Software - load slowly - Normal. Once in Open Apple Apps Store and find Big Sur and download. Try not to let computer go to sleep mode or Screen Save to activate. Be patient as one knows it Big Sur is 12.18 GB size. There are often periods where it seems to pause the download , normal be patient as countdown clock may say 15 minutes but in Real Time could be 30 - 45 minutes. This can and will happen several time in the process. If all goes well. it will successfully download and attempt to Launch. Do NOT allow it to start - Quit the Installer. Check Applications Folder for new App called Install Bug Sur. Make a copy to External Drive - future usage. Now, restart again in Safe Mode - then launch the Installer.

Mar 14, 2021 10:08 PM in response to PRP_53

SUCCESS!! Thank you, P. Phillips! I followed your suggested procedures to a "T". BIG SUR is now updated to Version 11.2.3!!

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ONE WORD of Caution:

Be sure to use an Apple Keyboard or a third-party keyboard connected to a USB port to input any utility command, such as "press Shift key," to start the computer in Safe Mode. A third-party wireless keyboard will not work.

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Update #11.2.3 to BIG SUR fails to install after downloading

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