OSX El Capitan
I have an offline computer running an old OSX operating system.
I would like to connect that computer to the web for a brief few minutes in order to install HomeBrew and install a newer version of rsync. I will use the command line.
What can I do to reduce security risks while connecting?
Maybe block some traffic through my router? There wont be other computers/ devices on my network needing to connect at the same time. I can probably connect through a mobile phone (Android 9.0 or iOS 14) if that helps at all.