Check your system type, then download either Desktop or WPF. Extract the ZIP to its own folder, close any running client, and follow the installer prompts. Don’t run the old and new instances at the same time: if both listen on the same ports, the core may fail to start or your browser may not connect.
After the first launch, check the local mixed-proxy listening port, then import an existing subscription or server configuration. Select a server and test the connection before enabling automatic system proxy configuration. Start by testing with a browser; you don’t need to enable TUN right away. When switching interface editions, keep your subscription, routing rules and ports unchanged. Change one thing at a time to make it easier to identify the cause of any issue.
If Windows blocks the installation, check the app name, file source and reason shown before taking action. Don’t disable system protection altogether. If a runtime component is missing, install the required component for the correct architecture. Switching interface editions usually won’t fix a missing runtime. See the Windows installation and setup guide for detailed steps.