![]() Full stepsĭownload macOS Catalina, Mojave, or Sierra > Create bootable USB > Clean install macOS. Turn of Mac > Hold Command + R keys and power Mac back up > Enter recovery mode. Start Mac > Hold "Shift" until the login window appears > Release the key when login in window appears. ![]() Shut down Mac > Unplug all cables > Plug in cables back after a few minutes. Have you managed to fix the macOS Big Sur download failed error? Which fix worked for you? Are we missing something? Do you have a better one? Use the comments section to share your feedback.Restart Mac > Hold Command+Option+P+R keys to turn on Mac. Tip: Check our detailed guide about how to free up storage on Mac! Anything less than that will cause the download to fail. macOS Big Sur requires up to 30GB of free storage for deploying.Įven minor updates like the macOS Big Sur 11.5.2 require at least 3GB of free storage. Last but not least, you should check if there is enough free space available on your Mac.
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