alt Hacker News> The updates are over https. The default certificates are 10year expiry.
I wish I knew this last week while trying to restore a 2010 21" iMac.
Apart from this, I encountered another annoyance mid-way; the official download urls for Sierra and High Sierra were nowhere to be found. I somewhat remember being able to download the official dmg/disk image from some official repository, probably some App store public url?
can look for macos downloader scripts in github. I noticed the readme here shares some URLs though I'm not sure if they still work https://github.com/Comp-Labs/Download-macOS
https://github.com/chris1111/Download_Install_macOS could also be another option.
I know I used one of the macos downloaders from github before, I just forget which one though.