What's new in Flash Builder 4 (4.0.1) Support for Adobe AIR 2 Support for Flash Player 10.1 Support for Flex SDK 4.1 Bug Fixes http://www.adobe.com/support/flex/downloads_updaters.html Flash Builder 4.0.1 updater, Windows (ZIP, 261.32MB) | Release notes Flash Builder 4.0.1 updater, Mac (DMG, 280.55MB) | Release notes
