Windows x64 build. Download, run, activate with your license key.
Save loader.exe anywhere. Windows may show a SmartScreen warning on first run — click "More info" then "Run anyway".
Buy a license from the get key page. Your key is issued instantly and shown once — save it.
Run the loader, paste your key. It fingerprints your machine, binds the key server-side, and stores a session for instant re-activation.