I can't seem to update the software to a latest edition?
Hiya! I'm not sure what software edition I have and would like to make sure I'm as up to date as possible. Some apps/services I have paid for don't seem to work on the current version I have, and I was asked (by those 3rd parties) to upgrade to the latest version, Catalina. However, when I got into my appstore, there doesn't seem to be an update for me to do? And when I go into the system preference, it doesn't give me the option of "software updates". Any help I can get would be mighty appreciated, many thanks!
Forgot to mention my device is a MacBook Air (13-inch, Early 2015). When I look in the "about my Mac" it shows I'm macOS Sierra, version 10.12.6
Nadya