OS update
Hello, I have a slightly older Mac that's running High Sierra version 10.13.6 operating system.
When I check for operating system updates, it shows nothing available.
Any ideas on why it wouldn't update?
Here is link to screencast to better clarify....thanks in advance: https://www.useloom.com/share/0cb8064d57454174999a1380ca8e7082
MacBook