After downloading, extract the archive to a writable folder. Don’t run the installer from the archive preview window. If Windows says the program is in use, quit v2rayN from the system tray and check that no older instance is still running. Desktop and WPF may use different configuration paths or migration methods, depending on the version. Export your settings before switching interfaces, and don’t overwrite the old folder.
On first launch, import a subscription or server settings, select a configuration, then enable “Set system proxy.” The system proxy affects only apps that honor it; a working browser connection doesn’t mean every program is using the proxy. If you need a virtual network adapter to route traffic from more apps, read the TUN mode guide. Avoid changing routing, DNS and network mode all at once on first launch.
If the interface starts but connections fail, check the specific error in the logs. A missing runtime, an unreachable server and an incompatible subscription field are different problems. Reinstalling the same package won’t fix incorrect server settings or provide connection configuration.