Mac stuck in the middle of a MacOS update? Here's what you need to do if you're having trouble updating your Mac - including what to do if your Mac does not start because macOS can not be installed. Although macOS is a very robust operating system, system updates can sometimes be a problem. If you're having a Mac frozen during the system update, here are some ways to back up your data, tackle the problem, and fix it.
1. Check the Apple servers
When Apple releases a new macOS update, many people hasten to grab it, which can cause problems with Apple's servers. Therefore, your first point of contact might be to check the system status page and check for macOS software updates to see if there are any known issues.
2. Switch to a wired connection
You may find things go faster if you switch from Wi-Fi to a wired connection. Read more: How to solve WiFi problems on Mac
3. Download the software from the Apple Support website.
If you're having trouble downloading the update through the Mac App Store, you can also use the Apple website. For example, you can find the latest macOS updates here. To search for a software update on the site, simply search for it.
4. Cancel the download
You may be able to repair a blocked update by going to the Mac App Store, searching for the software you are downloading, and then pressing Option / Alt. When you do, you should see the option to cancel the download.After canceling the download, you should be able to restart it, no problem this time.
Other way: In the "MacOS could not be installed on your computer" screen
- Press and hold the "option" key and click restart
- In the "Startup Disk Selection" screen, use the arrow keys to select your primary hard drive (not the MacOS update).
- Wait for your Mac to start normally
- Download the latest combo update directly from Apple. (This is a complete system image, not an incremental update)
- Open and install the update
- Take a snicker, it will take some time