I don’t know how unique my experience is, but Catalina is so unstable it’s totally unusable. Downgrading to Mojave (which was it’s own thing) has made the trashcan a far better Mac experence.
You have to do this from an elevated terminal, but it’s a quick fix to block the stupid Catalina upgrade:
TrashCan:~ jsteve$ sudo /usr/sbin/softwareupdate –ignore “macOS Catalina” Password: Ignored updates: ( “macOS Catalina” )
And there we go.
And there we go, Catalina is now banished!
Although that means this 2013 machine is really now obsolete and stuck in the past.