Opencart is inconvenient and not functional in work with downloads. Files are downloaded in one place, and files are attached to goods in another place. Excessive actions take precious time. And the customer only can download files from his personal account after purchasing od the good.
Advanced Downloads includes the features of such modules as Easy File Attacher and Downloadable Files. There were several versions of the module for internal use, and now the first public version of Advanced Downloads is finally ready.