I’ve tried 3 times to install macOS Big Sur 11.2.3 Keep getting message: Installation failed An error occurred while installing the Selected updates.

Thanks for your response. I was able to finally load the new system after performing some basic apple maintenance operations.

I turned off screen saver

Disconnected external drives and all peripheral devices

Zapped PRAM

Shut down computer and unplugged it for a minute

Started back up

Went to system preferences/updates

Double clicked on System Update/Big Sur 11.2.3

This time everything downloaded in a little less than an hour and so far, running with no problem.

Thanks for your kind offer of help. Greatly appreciated.

m

Hi mingoslkd,

Before making any changes to my router settings, I tried a couple old mac maintenance fixes I hadn't performed for a while.

I turned off screen saver

Disconnected external drives and all peripheral devices

Zapped PRAM

Shut down computer and unplugged it for a minute

Started back up

Went to system preferences/updates

Double clicked on System Update/Big Sur 11.2.3

This time everything downloaded in a little less than an hour and so far, running with no problem.

Will wonders never cease?

Let me thank you again for your help and kind response to my query.

m

Hi mingoslkd

Thank’s for your answer and help.

Both Firevault and Firewall are turned off in my system settings.

I don’t use any VPN’s on my system that I’m aware of.

My computer is ethernet connected, I only use WiFi when

airdropping from another device.

In my router settings under Security/Firewall, both

IPv4 and IPv6 firewall protections are enabled.

Under VPN Passthrough:

IPSec Passthrough

PPTP Passthrough and

L2TP Passthrough are all checked as enabled.

I’ll try disabling these items on my router and installing the new OS.

Thanks again for your help.