Update to Big Sur 11.2.3 stops at the end of the upload all the time

A couple of methods. Shutdown Router then same to computer. Disconnect all external drives. Restart Router and connect computer via Ethernet Cable ( Wifi is iffy ) Restart computer in Safe Mode ( Shift ) - immediately at startup. It does Repair Disk, Clears cache and only loads Apple Software and Fonts. Load slowly - normal. Try again and if possible do not let computer to go into Sleep or Screen Saver mode.

If over Wifi - same as earlier except Disconnect All Other devices using the wifi - what the Max Bandwidth for this computer.

Extremely Welcome and very pleased to have assisted in resolving your issue. Most important - you can get back to using the computer without delay.

Thank you Too. Realize you too helped by marking it Solved, others with similar issue can now find a possible solution on their own.

Do come back to the Apple Forums if / when addition issue arise or just to help someone else.

Pierre