FreeBSD capstan bash not found

wget http://osv.capstan.s3.amazonaws.com/capstan/v0.1.8/freebsd_amd64/capstan return 404. Other tags for BSD not working too.

`<Error><Code>NoSuchKey</Code><Message>The specified key does not exist.</Message><Key>capstan/v0.1.8/freebsd_amd64/capstan</Key><RequestId>A4C313CABC716F52</RequestId><HostId>H5uSSEcq0JVRUok1gZf5jFFjoCuYlumJnaHPqnQl0sdKITcLKkLuMt6XDWbT7+kQkdAF2D8KKGc=</HostId></Error>`