Can't Update OS
I'm currently on macOS High Sierra Version 10.13.6 using a Macbook Pro 2017. I'm trying to update to the latest operating system so I can use a design software I downloaded, but every time I select "Software Update" it's opening the app store, but not displaying the new OS.
This computer is relatively new, has never given me problems and I hardly use it. Is there a way I can force update the OS?
Thanks
MacBook Pro 13″, macOS 10.13