Carbon Copy Cloner requires OS X. CCC will not run on Windows.
Carbon Copy Cloner 4 is the latest version available. Users running Mac OS X 10.8, 10.9, or 10.10 should use this version of CCC. If you are having trouble downloading CCC from the link above, try this alternate download location.
Yosemite support: Carbon Copy Cloner 4.0.2 (and later) is qualified on OS X Yosemite.
Carbon Copy Cloner 3.5.7 is compatible with Snow Leopard, Lion, Mountain Lion, and Mavericks. Note that while this version of CCC will work on Mountain Lion and Mavericks, we recommend that Mountain Lion and Mavericks users upgrade to CCC 4. We will continue to offer limited support for 3.5.7 on a case-by-case basis, but we are no longer actively developing this version.