I can't update macOS.
Right now I'm using Mac OS Big Sur 11.6.2. I tried to update my macOS but got a message like this...
"An error occurred preparing the update. Failed to prepare the software update. Please try again."
iMac 27″ 5K, macOS 11.6
Are you trying to update to 11.7.10, or what?
How much Free Space on your Hard Drive?
In Disk Utility>View, select Show all Devices, highlight the top left entry.
Run Disk First Aid on all items in the left panel, from top down.
Are you running any VPN, Anti-Virus, or Cleaning apps?