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RecommendedDesktop is the newer cross-platform UI. It’s a good fit for first-time installs and for users who want a similar interface across desktop operating systems. You’ll still need to check your server list, subscription groups, and settings after the first launch. Changing the interface doesn’t connect you automatically.
WPF is the established classic edition. Choose it if you’re already comfortable with the traditional Windows layout. Base your choice on the interface and workflow, not the server protocol. Protocol support depends on whether the selected core and server configuration are compatible.
Both downloads are ZIP archives. Once the download finishes, extract the archive to a separate folder before opening the installer. Don’t run it from the archive preview. Keep the folder path short and avoid temporary folders that may be automatically cleared.