Look at the Log to see if your Mac is still installing macOS The Mac might have been stuck on 20 minutes remaining for the past two hours, but this doesn’t necessarily mean it’s not busy trying to install the software. Sometimes things get slowed down because the Mac is taking a while to install one file behind the scenes and that’s thrown the whole update time prediction out the window. In our experience one minute it tells us there will be a two-hour wait, then 45 minutes, then an hour, before jumping down to 20 minutes. Remember, the progress bar you see during installation is just a best guess at how long it will take. Sometimes updates can take 16 hours or more – especially on the days when Apple releases a new version of its Mac operating system. Sometimes it’s worth leaving the Mac overnight to finish the job it’s started. You may be confronted by what looks like a frozen update, but if you leave it for a few hours it could finally get to the end of its task. Sometimes updating the software on a Mac can take a Very. An error occured while installing the update”. However, when we returned we saw the message that: “Installation failed. The first clue that something was going wrong was when it looked like the download of macOS Big Sur was finally complete – with the complete 12.2GB downloaded – but the bar was stuck with some distance to go, we left it alone for an hour or so in the hope that it would right itself. We’ll share what happened in case it is helpful to you: In fact, we experienced this exact problem with our attempt to download and install Big Sur. There were multiple reports of people having difficulties downloading Big Sur. With the Big Sur update, if you saw the error message: ‘Installation failed: error occured while installing the update’ you were not alone. That is the problem we encountered, as we will detail below. Lack of space was quite a common problem among those with 128GB Macs. Since the macOS Big Sur installation required around 48.5GB free space – that’s 35.5GB plus another 13GB for the installer itself. You can do this by clicking on the Apple Logo > About this Mac > Manage and then choosing Messages and deleting as many images and videos as you can. One great way to free up space is to delete the images associated with the Messages you’ve received on your Mac. You could for example delete old emails and text messages, or locate old Time Machine backup files from your Mac and delete them. We offer advice on making more space on your Mac here: So that’s more 45GB required before you start – you might want to read this:ĭon’t bother trying to update to Big Sur if you have a 128GB Mac. We actually needed 35GB available when it came to doing the installation. You’ll see below that even 20GB space isn’t actually sufficient when it comes to installing macOS Big Sur though. Possibly there isn’t adequate space available on your Mac (we always recommend that you don’t install if you have less than 20GB of space free as your Mac may struggle with the installation otherwise – in fact with Big Sur weighing in at just over 12GB, and Monterey likely to be just as large, you’ll need all the space you can get!) It is likely that if a similar problem happens in Monterey we will see an update soon after launch. Second Big Sur 11.2.1 update fixes Mac installation issue. Read about Big Sur version 11.2.1 (build 20D75) and how it fixes the problem in this article: Apple issued an update to Big Sur that addressed this particular problem on 15 February 2021. As a result the installation would be unable to complete and all the storage available on the Mac would be filled making the Mac unusable. In 2020 when Big Sur launched some Mac users were unfortunate enough to experience an issue where the installer would fail to check how much space was available before installing the operating system update. In this case the problem seems to affect computers that feature Apple’s M1 chip, but there are also reports of Intel Macs being affected. Problem with the USB 3.0 ports – mainly affecting hubs, but also some USB peripherals do not work properly after the upgrade. If you encounter the bug you may find that force-quitting your applications or rebooting your Mac fixes it.
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