How do I upgrade to Catalina NOT Big Sur
Hello,
Looking for help and I need an idiots guide please as I haven't done this in a long time.
I want to upgrade from Mojave to Catalina and not Big Sur.
If I go to system preferences it looks like it will download Big Sur which I don't want, so how do I download Catalina please.
Many thanks in advance.
Catherine
iMac 27″ 5K, macOS 10.14