Hello,
I suspect that the user has a long name and the library contains long paths (either too many folder levels or long object names) and when the library data is downloaded, Archicad fails to read the files.
Try to reduce library object names to minimal, it might fix the issue for your unlucky colleague too. If not, I suggest to contact your local support with a Support Package, so they can help you find the reason.
Kind regards,
Noémi
Noémi Balogh
Community Expert, Admin