Bitmask requires Mountain Lion or newer.
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.
You can browse all releases for old or experimental downloads.
You should install the latest stable release. Downloads tagged with “RC” are “Release Candidates” and receive frequent experimental updates that may break the application.