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Unable to complete download of update MacOS. BigSur 11.5 stops at 5 minutes to completion.

I am not able to update . It appears that my Wifi is working just fine . It stops at 5 minutes to completion. HELP ??

Posted on Jul 24, 2021 8:11 AM

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Posted on Jul 24, 2021 8:18 AM

A few ideas:

  1. Do you use a VPN or some anti-virus software? If so turn them off.
  2. Restart your Mac and try again
  3. Restart in Safe Mode and try again (How to use safe mode on your Mac - Apple Support)
2 replies

Jul 24, 2021 10:23 AM in response to zev241

This method may seem unnecessary but sometimes the Router Restart clears Network issues from ISP to Apple Servers


Shutdown Router. Shutdown computer and disconnect all External Drives. Restart Router. Connect to Router via Ethernet Cable. If via Wifi - Disconnect all other Devices using the Wifi - want the Maximum Bandwidth only for this computer. Restart computer in  Safe Mode. It does a Repair Disk, Clear System Cache files and only load Apple Software, extensions and Fonts. Will load slowly - Normal. Once Logged in - open Apple Apps Store and  Get the Full Version of Big Sur. It will take some time and several pauses will occur - normal. Countdown clock may say 15 minutes but in Real time may be 30 minutes. Same goes for clock at 10 minutes could be 20 minutes in Real time. Eventually , Full Installer will download and a New Application in Applications Folder will present called Install Big Sur. Stop there and perform a Time Machine Backup. If desired - have an External Drive - Copy & Paste the Install Big Sur Application to external drive for future usage - making a Bootable Installer. Now run the Installer.


Have found this method more reliable than the Software Update which is very iffy at best


Are there any AntiVirus, Disk Cleaner, Optimizers, Defrag, VPNs etc installed which should be removed as per Developers Instructions. They are useless, unneeded, cause havoc and interfere with the normal operation of the OS and may even Corrupt the OS requiring a Reinstallation.

Unable to complete download of update MacOS. BigSur 11.5 stops at 5 minutes to completion.

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