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Unable to upgrade to Big Sur for 3 weeks today still error

is there anyone who has successfully upgraded to big sur macOS, it either installer damaged or failed to upload installer am using catalina currently!

MacBook Pro 13″, macOS 10.15

Posted on Dec 17, 2021 2:04 AM

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Question marked as Top-ranking reply

Posted on Dec 17, 2021 2:24 AM

Delete "Install macOS Big Sur" from the Applications folder. Download again while in Safe Mode.

How to use safe mode on your Mac - Apple Support

5 replies

Dec 17, 2021 3:35 AM in response to Dokoth

There are factors:


1 - Like poor Wifi connection


2 - Slow wifi connection


3 - Too many other people downloading at the same time and Apple Severs are overloaded


4 - Software on the computer interfering with the download process including AntiVirus Software


5 - Running behind a VPN which may increase Packet losses and may corrupt the download


6 - If via wifi too many Other devices using the wifi at the same time reducing the Bandwidth to your computer. 


7 - Best Results are via Ethernet Cable to Router

Unable to upgrade to Big Sur for 3 weeks today still error

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