Cannot upgrade Mac Os from Apple Store
Hi,
I have a Mini Mac with Lion 10.7.5. When I try to upgrade to either Sierra or El Capitan, I get an error message to the effect that it is not possible to download the app and I should check my internet connection. Internet is working fine, firewall is off, and there are no proxies enabled. I am connecting through a router, but I should add that I also tried to start the upgrade while tethering to my phone, resulting in the same error message. Can somebody help me?
Mac mini 2018 or later