Big Sur Installer damaged. Download again.
Except I can't. I try to download again and it already sees the download, and goes straight to the install step. And the same error message.
How do I download the installer?
iMac 27″, macOS 10.15
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If all else fails;
Suggest - Shutdown Router and then Shutdown Computer and connect via Ethernet connection. Restart Router. 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.
