I am trying to Install Big Sur 11.5 on my Mac but it says that I have internet problems. My internet ir working. Is anyone experiencing this problem? and how can I fix it ?
[Re-Titled by Moderator]
If this update is for Big Sur 11.5 - the error message can be misleading. There are factors like poor Wifi connection, slow wifi connection, too many other people downloading at the same time and Apple Severs are overloaded, Software on the computer interfering with the download process, running behind a VPN and or / if via wifi too many Other devices using the wifi at the same time reducing the Bandwidth to you computer.
Best Results are via Ethernet Cable to Router
There are several ways to download the Big Sur 11.5 update.
1 - Connect to Router via Ethernet connection and restart the computer in Safe Mode and then open the Apple Apps Store and get the Full Installer of Big Sur. It will be the 11.5 version and once downloaded run the installer from the Applications folder.
2 - Resart the computer in Recovery Mode ( INTEL Command + r ) and choose Reinstall macOS. It too will download the full Installer and commence the installation. For M1 CPU the Recovery Mode is Here
3 - 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. They may also interfere with the Download process
Yes, its memory issue. I also removed few apps to free memory and installed successfully.
Although i had 100 GB plus free memory.
Thanks,
Amul
I had the same issue and was nothing to do with the internet connection, There was 10GB space left on my SSD hard drive so i deleted some VHDs and the Big Sur 11.5.2 update worked
I am also facing same error after downloading big sur 11.5.1 almost 3.4 gb. Seems issue is in big sur package.
Because I tried multiple times and lost around 20 gb data and always failed. I don’t see any internet connection issue.
Thanks,
Amul Patel
I am getting this repeatedly with the 11.5.2 update... I suspect it wants more space free as I only have about 10%.. but that is 220gb ffs :(
it does not work whatever the connexion. The result is the same when trying to install the update via the terminal except it seems to indicate there not enough available free space to install ( what seems to be wrong as the normal update process let know the necessary free space to get when required ).
I have tried 13 times to do this update in my iMac....which worked like a charm the first time on my MBP....and it downloads the 2.93GB and says it is preparing the update. Then, sometimes immediately, sometimes after the progress bar has made some progress, I get the message "Download Failed."
I have plenty of HD space... over 990 GB, so the problem isn't there. The internet is functioning fine and is the same one I used for the MBP, so I doubt that's the issue.
Yes, tried this. Same result. Dowloaded over 12 GB (unlike the 2.93 GB update) and then said "Download failed." I have over 900 GB free on my HD, so that's not the issue. Now I am wondering whether trying all these times to download the update, and then the full installer, are leaving fragments behind because my HD space has decreased by about 6 GB and I sure haven't added anything that large to it in the past three days!
Thanks, tried. Received this error message.
Downloading: 100.00%
Failed to download & prepare update: Error Domain=SUMacControllerError Code=7740 "[SUMacControllerErrorPrepareFailed=7740] Failed to perform Prepare operation: [MobileSoftwareUpdateErrorDomain(MSU):MSU_ERR_FILESYSTEM_DOESNT_VERIFY(3)_1_NSPOSIXErrorDomain:92|FullReplacementRequired|]
Hello,
Thanks for the command, but the update still can't get through, I get the following error :
Downloading: 100.00%
Failed to download & prepare update: Error Domain=SUMacControllerError Code=7723 "[SUMacControllerErrorPreflightPersonalizeFailed=7723] Failed to perform PreflightPersonalize operation: [MobileSoftwareUpdateErrorDomain(MSU):1256]" UserInfo={NSUnderlyingError=0x157809e50 {Error Domain=MobileSoftwareUpdateErrorDomain Code=1256 "Failed to find SFR recovery volume" UserInfo={NSDebugDescription=Failed to find SFR recovery volume}}, SUMacControllerErrorIndicationsMask=0, NSDebugDescription=[SUMacControllerErrorPreflightPersonalizeFailed=7723] Failed to perform PreflightPersonalize operation: [MobileSoftwareUpdateErrorDomain(MSU):1256], NSLocalizedDescription=Failed to personalise the software update. Please try again.}
Any idea please on what could be the cause?
Thanks in advance !
Yes, I completed all the remedy fixes and it's still failing.
Same issue...strong internet but download keeps failing. Come on Apple this is your problem
Big Sur 11.5 is a failure to download. Simply does not work.
this worked a treat
Ugh. How do I turn off notifications for all these replies. It's NOT helpful.
After multiple times my Air tried to download with the update tool, method 1 worked for me thanks!
Big Sur 11.5 Download Failed