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I have downloaded the MacOS Big Sur but when I tried to install, its failed. While trying to install, the following message prompts:
Downloading the installer build manifest failed.
Plz help.
Put the installer app in the Trash, empty the Trash.
Connect your mac to your router via cable.
Restart your mac, download Big Sur again,
do not use your mac while downloading or any other
devices that share the same internet connection.
Put the installer app in the Trash, empty the Trash.
Connect your mac to your router via cable.
Restart your mac, download Big Sur again,
do not use your mac while downloading or any other
devices that share the same internet connection.
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.
While trying to install, the following message prompts:
Downloading the installer build manifest failed.
Facing the same issue. Unable to install Big Sur.
Try again.
Unable to install MacOS Big Sur for my macbook air laptop model early 2015 and MacOS Sierra
