macOS Pre-compiled versions for macOS are available on the Google Code download page, or here: https://cdn.theunarchiver.com/downloads/unarMac.zip For older macOS versions, use the legacy version: https://cdn.theunarchiver.com/downloads/legacy/unarMac.zip

Windows The Windows versions are currently cross-compiled with Cocotron on macOS. You find binary versions here: https://cdn.theunarchiver.com/downloads/unarWindows.zip The Windows version is currently slightly outdated. An update will follow.

Ubuntu Ubuntu 12.04 packages unar and lsar, under the package name "unar". You can install them from the Software Center, or using the command line: sudo apt-get install unar