I did a fresh install of jDownloads.
Screenshot 1 - Set the permissions in the global configuration-> Public -> Download enabled
Screenshot 2 - Edit category (called Sinterklaas): It seems although it is set to Public, Download is disabled
Screenshot 3 - Edit category again, set Download enabled
Screenshot 4 - Add download in the category Sinterklaas, now I assume Download is enabled but again it is disabled ?!?
Is this the supposed behaviour ? Enable download for every