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Aim to keep 15–20GB of free storage on your Mac for installing updates. Your Mac needs to have enough free space to download the new update files before it can install them. However, the most common reason is a lack of storage space. Click Update Now or Upgrade Now: Update Now installs the latest updates for the currently installed version.īest answer for this question, why can’t I update my MacBook Air OS? There are several reasons you might be unable to update your Mac.From the Apple menu  in the corner of your screen, choose System Preferences.How do you make sure your Mac is backed up?.Why can’t I find software update on my Mac?.How do I manually update my operating system?.

What is the latest update for MacBook Air 2015?.