Updating MacOS: Cannot open file (-3001)
Thought I’d leave a note here for other that may encounter the same issue while trying to upgrade lately. I only got it on my Mac Pro but not on my Mac Mini nor Air.
A networking error has occurred: Cannot open file (-3001). Make sure you can connect to the the internet, then try again.The terminal came to my rescue. Here is the command:
$ sudo softwareupdate -ia
This will prompt you for your root password and then start downloading the packages. Hope it helps a few until they fix this shitty bug.