Similarly, if you’re upgrading from an earlier release, make sure you’ve up to 44.5GB available free storage to finish the upgrade. Although I believe the macOS Update Assistant should have warned in advance about this so that the update won’t fail midway. If you do not have that much free space, the upgrade will continue to fail. If you’re upgrading from macOS Sierra or later, macOS Big Sur requires 35.5GB of free space. The main reason behind the failure of this upgrade is lack of free space on your system. After ensuring everything is okay, you can now focus on retry the upgrade and finish it. Once you are login to your account, you can check that all of your documents are there. So select the second option and login to your account.Ĥ. First option is to finish the update, while the second option is to go to the current MacOS operating system and continue to regular login. Now your Mac system will give you two options. Make sure you hold the option/alt button before the Apple logo comes in.ģ. Now using the power button on keyboard, turn back on your Mac. On the error screen, click on the Apple logo and select Shut down.Ģ. Follow these steps, to login to your current macOS version.ġ. But for that, you need your Mac working as usual. To fix this problem, you need to bypass the update and retry it. Fix: ‘An error occurred preparing the software update’ while upgrading to MacOS Big Sur Although to finish the update and make your system working again, you need to follow some workarounds. First of all, there is no need to worry about your data because it is safe and will not be impacted because of this error. Well, I will try to answer these questions in this article. If you are at this point, you might be wondering what will happen to your system now? Will your data be corrupted or deleted and you won’t be able to access it again? How you can revert back to the your normal working Mac from here? Now it won’t go ahead or even let me cancel the update so that I can revert back to previous version. Since I got this message, the upgrade process ceased at that point. However, before a final restart, I got An error occurred preparing the software update message. Everything went smoothly till a final restart to finish the update. Recently I tried to upgrade my MacBook to Big Sur. But sometimes, you might face trouble to finish the update. Usually, the upgrade should continue to finish without any error. Make sure you’ve downloaded latest installer which properly checks for available space on the machine and then only lets you install MacOS Big Sur.Īpple recently released macOS Big Sur i.e. UPDATE (): Apple fixed this issue with updated MacOS Big Sur installer.
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