LeJOS NXJ is available for Windows, Mac OS X, and Linux. Open the folder with the version you want and choose one of the files suitable for your platform. You can choose from

• leJOS_NXJ_.tar.gz: Archive for manual installation on Linux and Mac OS X
• leJOS_NXJ__win32.zip: Archive for manual installation on Windows
• leJOS_NXJ__win32_setup.exe: Installer for automatic installation on Windows
• leJOS_NXJ__samples.zip: Sample projects, for all platforms
• leJOS_NXJ__source.tar.gz: leJOS NXJ sources, for all platforms