My macbook air 2019 will not install 11.2.2
Sure it will.
Sorry, but it won’t. I’ve tried half a dozen times and all it does is overheats and gets stuck at the last ten minutes. Could you maybe provide a bit more details?
Try while in Safe Mode.
How to use safe mode on your Mac - Apple Support
Do as @dialabrain suggested. If that fails, Shutdown Router. Shutdown computer. If via Wifi disconnect All Other devices using Wifi. Move as close the Router as possible. Restart Router. Restart Computer as @dialabrain suggested - Safe Mode - an try again