Mapbox Studio Classic, which used CartoCSS, is no longer in active development. To learn more about our newer mapping tools see Mapbox Studio.
Mapbox Studio Classic is no longer available to download, but you can download CartoCSS as a stand-alone command-line tool using the instructions in its GitHub repository.
Creating a new map? Mapbox Studio is the modern alternative to Mapbox Studio Classic. If you're creating a new map today, you should use Mapbox Studio instead of Mapbox Studio Classic.