Internet error updating to Big Sur
Big Sur 11.4 UPDATE
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[Re-Titled by Moderator]
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Try the following:
#1 - boot into Safe Mode according to Start up your Mac in safe mode - Apple Support.
NOTE: Safe Mode boot can take up to 10 minutes as it's doing the following;
• Verifies your startup disk and attempts to repair directory issues, if needed
• Loads only required kernel extensions (prevents 3rd party kernel/extensions from loading)
• Prevents Startup Items and Login Items from opening automatically
• Disables user-installed fonts
• Deletes font caches, kernel cache, and other system cache files
#2 - go to the App Store, search for and download the full Big Sur installer.
#3 - run the installer from the Safe Mode.
I've had better luck goring thru the App store than thru the System/Software Update preference pane.