The Download Manager is a dedicated feature in the Harden System Security app under the Extras section. It can accelerate your download speeds and offers many features and capabilities that go beyond the built-in browser download experiences, making it a resilient download manager suitable for any use cases.

You can add downloads in multiple ways:

• Add Links button: Opens a dialog where you can paste one or more direct HTTP/HTTPS links.
• Clipboard-aware input: If your clipboard already contains links, the dialog preloads them automatically.
• Keyboard shortcut: Press Ctrl + V on the page to immediately queue valid links from the clipboard.
• Drag and drop: You can also drag and drop links from a browser or text file directly into the app. (Only works when running unelevated.)

The app detects all valid links in the pasted text and queues them together.

The top command bar provides quick access to the main queue operations:

• Search: Instantly filters the current list.
• Add Links: Queues one or more new downloads.
• Settings: Opens the dedicated Download Manager settings page.
• Speed Preset selector: Quickly switches between Slow, Medium, and Full download-rate presets.
• Selection actions: When you select one or more items, bulk Pause, Resume, Delete file, and Remove from list actions become available automatically.

The list also supports drag-and-drop. If a selected item already has either its completed file or a partial file on disk, you can drag it out of the app to another destination in order to play or run it.

Every download item has quick actions and a flyout menu for common operations:

• Open the containing folder
• Pause or resume the transfer
• Open the downloaded file
• Delete the downloaded file
• Copy the original download link
• Change the download link
• Calculate file hashes
• Remove the item from the list without deleting the file

If a signed or time-limited link expires, the item flyout can be used to replace it with a new link.

The replacement link is validated before it is accepted:

• It must be a valid HTTP/HTTPS URL.
• It must resolve to the same file name.
• If size metadata is available for the existing item, the replacement must also match the same file size.

For files that already exist on disk, the item flyout can display hashes in a dialog. The current implementation supports:

• SHA-2 256
• SHA-2 512
• SHA3 256
• SHA3 384
• SHA3 512

The Download Manager is built to be resilient rather than assuming every server behaves perfectly.

It includes:

• Checkpoint-based resume support so interrupted downloads can continue later
• Parallel downloading when the source supports byte ranges
• Automatic retry/backoff handling for transient request and stream failures
• Conflict handling when the target file name already exists
• Metadata-based file-name resolution using server response headers and other fallbacks when the raw URL is not the real file name

The Download Manager has its own settings page where you can control how transfers behave.

• Change the default save location for downloaded files
• Restore the default Downloads folder
• Open the Download Manager's storage location used for its internal state data

• Set the maximum number of simultaneous downloads
• Set the number of parallel connections per download (does not apply to downloads that are already in progress)
• Choose an action to run after all downloads finish
  • None
  • Shutdown
  • Sleep
  • Hibernate
• Choose how file-name conflicts are handled
  • Ask
  • Overwrite
  • Add duplicate
• Enable or disable automatic removal of completed downloads from the list

When the automatic removal option is turned on, completed items are removed from the list and their stored checkpoints/history state is cleaned up automatically, while the finished files remain in the selected download folder.

The three preset modes can be configured from the settings page:

• Slow
• Medium
• Full

The Full preset can also be set to unlimited mode.

The preview area is designed to provide useful visual information about the download items:

• Images and supported visual files can show thumbnails.
• Videos can show a static preview and when you hover over them, a short preview clip is played.
• Placeholder text is shown when a preview is not available yet

The Download Manager is especially useful when you need one or more of the following:

• Downloading multiple links in one session
• Resuming interrupted large-file transfers
• Handling short-lived links that may need to be refreshed later
• Controlling bandwidth with presets
• Verifying downloaded files with built-in hash dialogs

It is meant to provide a practical, reliable, and security-conscious download workflow directly inside Harden System Security without relying on a separate external download tool.