How can I install Mac OS X and updates without the need for an Internet connection?
I have recently purchased a MacBook Pro 16-inch, and Catalina 10.15 was pre-installed even if I would have preferred to install everything by myself.
Now I want to upgrade to 10.15.6. I downloaded both the full version and another upgrade. However, I tried both but there popped up a message stating that I needed an internet connection in order to install the upgrade, and the same happened when I tried to install the whole operating system.
I find it unacceptable that I cannot install programs or upgrades on my own computer without being dependent on an internet connection in order to maintain my machine. I have paid for my computer, and it should be capable of installing programs and updates also in the absence of any net connections and services.
So therefore I ask: How can I install Mac OS X and updates without the need for an Internet connection?