If you haven’t already, I would be very cautious to upgrade. Catalina is a major upgrade. It locks down security further, removes 32-bit support amongst other changes. A normal rule of thumb for many users is to wait for at least 3 .x releases. Just because the upgrade is free does not mean you should upgrade. On any system including iOS I never use automatic updates. They are the quickest way to break a working system. I’ve only just upgraded to Mojave.
I’d encourage anyone to read the many blog posts on the internet that detail Catalina changes.