The Download Now link directs you to the Mac App Store, where you can continue the download process. You must have an active iTunes account to download the application. This download may not be available in some countries.
From Voros Innovation:
Introducing Weather HD - a stunning, unique app which brings the weather to life right on your desktop. It gives the weather forecast and turns your desktop into a beautiful animated wallpaper scene matching the conditions. Weather HD can also function as a screensaver. Current weather conditions and forecast on your desktop from all around the world. Animated weather wallpaper scenes matching current weather conditions, today's or tomorrow's forecast. You can also select your favorite weather wallpaper scene or make it random. Animated weather wallpaper: Scenes match current weather conditions, today's or tomorrow's forecast. Option to select your favorite weather wallpaper scene. Option to make wallpaper scenes change randomly. Detailed weather forecast window accessible by a singe click on the Dock icon. Dock icon showing the weather: Icon badge shows Current Temperature, Wind speed or "Feels like" temperature. Weather conditions icon. Weather conditions text. Adjustable Desktop Weather Widget: Widget style - Choose from 5 different styles. Location on the screen - Move it anywhere you want on your desktop. Size - Set as small or large as you like. Transparency - Make it see-through. Search forecast locations by address, airport code or automatic location based detection. Save as many locations as you want. Screensaver option ("Show Desktop" feature moves all other windows out of the way). Forecast and conditions are updated every 60 minutes. Features: Accurate weather forecasts and local time for any location around the world. Your first location is auto detected and new forecast locations can be added by typing the first few letter of the city name, zip code or airport code in the search field. Current temperature as an icon badge right on the desktop .7-Day detailed weather forecast (3 days for free version). 2-Hourly weather forecast for 3 days. Temperature. Wind speed & Direction. Humidity. Weather forecast text summary. Min and Max temperatures. Current "Feels Like" (apparent) temperature. Wind Speed and Direction. Dew Point. Humidity. Rain fall information. Local Sunrise and Sunset. Units: Fahrenheit or Celsius & mph or kmh. Time format: "System Default", 12-hour or 24-hour. Accurate, premium weather data from Weather Underground.