I am trying to upgrade MacOS's version, I am currently using : High Sierra 10.13.6
I have been avoiding it to prevent compatibility problems but I've seen to many times restrictions saying I can't use some software because my version is ancient...
But now that I am trying be up to date, and I actually can't do it. When I open the App Store, I have no available updates.
Is my machine too old, and won't work with the news OS ?
Edit1 : How do I upgrade ?
Thank you for your help.