An error occurred while installing the selected updates.
I am trying to update my late 2012 iMac (Mojave) to Catalina.
The process start and the the following message appears:
"An error occurred while installing the selected updates."
I've installed Catalina updates on other iMacs of the same vintage in recent weeks.
I haven't tried the recovery option yet.
Thanks
iMac 21.5″, macOS 10.14