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Desktop uses a newer cross-platform UI; WPF is the classic, stable edition. Both let you manage subscriptions, choose nodes, and configure a proxy. Pick the interface that suits you.
The download is a ZIP archive. Extract all files before running the installer; don't launch it from the archive preview.
Choosing between Desktop and WPF
New users can start with Desktop; users familiar with the traditional Windows interface may prefer WPF. Different interfaces don't mean different subscription contents, and protocol support depends on the configuration and what the client supports. Before switching editions, export or note your existing groups, routing rules, and local settings. Don't copy the entire old configuration directly into the new folder.
First checks after installation
Install the program in a location your account can write to. If startup reports a missing runtime, install the component named in the error. If security software blocks the app, check which file was flagged and why. Ordinary system proxy use generally doesn't require running as administrator. Grant permissions when prompted for network features such as TUN.