I wonder if there is a way to permanently block the downloading of objects from BIM Components within Archicad. I would like to personally manage the objects that the architects will use in the projects instead of giving them the power to download (often unintentionally) library objects not approved by by me.
Have you tried editing the Permissions in their Roles in the BIM Cloud Manager?
Disabling "Libraries add/remove", Library part - Create", "Library part - Delete/modify".
Haven't tried myself, but sounds like to me that it might do what you need.