Starting macOS Mojave access to Apple Safari's cookie database is forbidden by default. Without access to this database Progressive Downloader is unable to download files from sites that use cookies to verify user session.

In other words, if you see a notification that file Progressive Downloader is unable to access file, just like the one below, it might be the case.

You can allow Progressive Downloader to access the cookie database using the steps below: Open Security & Privacy. Click the lock icon ❶ to be able to modify the list of applications. Open your Applications folder. Add Progressive Downloader from to the list ❷. Quit and relaunch Progressive Downloader. Open Integration and find and activate usage of browser's cookie storage.