Catalina updates for iMac won't load. Just hangs
Hi
The last two updates for my iMac 10.15.3 and 4 won't load. It just hangs in the middle of the process. Apple support told me how to do it by macOS Recovery, but why does it fail. Since installing Catalina I often am unable to shut down properly. Not sure if this is related. Support gave the machine good spring clean but to no avail. It's a 2013 December model.
Everything else is Ok
Chris
iMac 21.5", macOS 10.15