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Version 5.53 is has some new features and optimizations over the earlier 5.5x releases. A brief summary:

• Implemented header compression support for Giganews. You no longer need the Giganews Accelerator to get this functionality.
• Performance optimizations for loading stored headers and processing single part posts.
• Added progress bars to show progress of certain tasks (configurable).
• Added logic to better handle possible conflicts with anti-virus software.

You can review the entire development process in the release notes which are available for viewing after you run the installer.

The release information and download links are here: 32 Bit | 64 Bit