This plus mode is a way to say thank you for spending a few dollars to support the project. It gives you access to new advanced features:

• Use dedicated process for each download task – a more robust and aggressive way to download files.
• Complete integration with Apple Safari, Google Chrome or Mozilla Firefox – the easiest way to replace the built-in download manager with Progressive Downloader.
• Configurations – use separate settings for different Wi-Fi networks or browsers.
• Working mirror search – search the Internet for an alternative source of a file that cannot be found using the link provided.
• SMB and AFP support in File Browser - operate with SMB and AFP resources in the built-in File Browser.
• Instant video downloads – download video hosting platforms without delays1. Currently supported platforms: flickr.com, imgur.com, instagram.com, reddit.com, tiktok.com, youtube.com and more.

Open the Plus tab, click Enable Plus Features 2 and follow the steps on screen.