Update #11.2.3 to BIG SUR fails to install after downloading

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.

Got the same issue since the very first BigSur update (I'm still on 11.1), it downloads pretty fast, at least it looks like that, but when it starts to "install" simply hooks up. And shows this message

No matter how many times I retry it's the same, even after restart or reset NVRAM or do what ever you want.

MacBook pro (15inch 2018)

I have the same problem. Mine downloaded the update overnight and after I clicked to restart and finish the install, it became stuck at about 3/4 of the way through the progress bar. Going on 1 hour. What should I do?

Great News and Thank you too for marking as Solved.

You too have assisted Others experiencing similar issue as Solved makes it easier from Others to find the solution.

Thank you so much. Was stuck and clueless for many months. Followed you procedure and it worked for me.

Cheers

Very Welcome :-))