It was available for online browsing or as a downloadable file, I think a zip compressed PDF. I’m sure copies are available, but it would be nice to have an authoritative source.
As far as I can tell the single zip downloadable versions stopped being published after 2020. I grabbed a copy of the 2020 zip from the Internet Archive and turned it into a GitHub repo here: https://github.com/simonw/cia-world-factbook-2020/
Just in case anyone else wants to poke around and discovers there appears to be archived versions after 2020[1]... don't bother. They all 404. At a guess: There were links to them in anticipation of creating updated zip files but they never got around to it. Lame.
It was available for online browsing or as a downloadable file, I think a zip compressed PDF. I’m sure copies are available, but it would be nice to have an authoritative source.