Once the bar loads, you'll get a quick overview of your available storage. Select the Apple menu > About This Mac > Storage. Here's how to check your available disk space: For instance, if you're upgrading from macOS Sierra or later to macOS Big Sur, this update requires 35.5 GB, but if you're upgrading from a much earlier release, you'll need 44.5 GB of available storage.

The single most common reason your Mac won't update is lack of space. Here's a handy list from Apple that shows you which devices are compatible. If you're trying to install macOS Big Sur as a starting point, it's worth checking that your Mac is actually compatible. Tip: Before installing any significant updates, be sure to back up your Mac, just in case. So, let's get started: what's the first step? Thankfully we've got all the troubleshooting tips you need if you're experiencing freezing, crashing or stalling during the download process. Here's are a few common reasons why a Mac won't update: Or are you experiencing freezing, stalling or crashing during the download? Don't worry we've got the reasons why and the tricks to help. The macOS installation couldn't be completed. Have you been plagued by the following warning messages?Īn error occurred while installing the selected updates. Since the macOS Big Sur arrival in November 2020, many users have reported problems downloading and installing it, so rest assured you're not alone, and the great news is, we have lots of troubleshooting tips to help. Installing the latest macOS update is usually a hassle-free and straightforward task, but if you've found yourself here, you must be one of the many people wondering “why won't my Mac update?”

Upgrading 2017 mac pro