Thanks to combining advice from this post from /u/afroeskimo over in /r/MacOS, a comment from /u/ASentientBot and this MacBook Pro random shutout fix instruction website, adapted from this MacRumors thread, I have (hopefully) fixed my MacBook Pro 2014 15” when it kept randomly shutting down on 10.15.5 Catalina. According to reports earlier this week, some users are facing issues when installing Big Sur on their 13-inch MacBook Pro from late 2013 or mid 2014.
Thanks for reaching out to the Apple Support Communities. I see that you’re having some trouble downloading the macOS Catalina update to your MacBook Pro. I’ll be glad to help you with some troubleshooting steps to begin with. Be sure to try downloading the macOS Catalina update after each of these steps:
1 - Be sure you’re connected to Wi-Fi for your Internet connection, and not a cellular hotspot.
2 - Check the macOS Software Update for any issues on this page: Apple - Support - System Status.
3 - Restart the MacBook Pro and try downloading again.
4 - Restart the MacBook Pro and boot into safe mode with these steps: Use safe mode to isolate issues with your Mac. Once in safe mode you may notice the screen flicker, this is expected, and will go away when you restart the MacBook Pro. While in safe mode try downloading again.
5 - Try downloading using a different Wi-Fi network.
Before you begin installing the update, you’ll want to be sure that you have a backup of the important data on your MacBook Pro. Having a backup of your data is like having an insurance policy, you don’t plan on using it, but it’s great to have if you need it. Check out this site for information on how to backup your Mac: How to back up your Mac.
I hope this was helpful.
Oct 14, 2019 7:13 PM