Bitmask requires Mountain Lion or newer.
Optionally, you can authenticate the signature for the Bitmask .dmg file using this signature file.
Once the file `Bitmask-OSX-latest.dmg` has been saved to your computer, mount the `.dmg` image and drag the `Bitmask` icon to your `Applications` folder.
If you want to install an old or experimental version of Bitmask, you can browse all releases.