Breezy support for Windows

When trying to install breezy via pip on my Windows 7 VM (note, this is currently 3.0b1), I get the following error (paths somewhat redacted for privacy):

    copying build\scripts-3.6\git-remote-bzr -> python36\Scripts
    Traceback (most recent call last):
      File "pip-install-n80qmf4c\breezy\setup.py", line 145, in run
        args = self._win_batch_args()
      File "pip-install-n80qmf4c\breezy\setup.py", line 162, in _win_batch_args
        from breezy.win32utils import winver
    ImportError: cannot import name 'winver'

    During handling of the above exception, another exception occurred:

    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "pip-install-n80qmf4c\breezy\setup.py", line 771, in <module>
        setup(**ARGS)
      File "python36\lib\distutils\core.py", line 148, in setup
        dist.run_commands()
      File "python36\lib\distutils\dist.py", line 955, in run_commands
        self.run_command(cmd)
      File "python36\lib\distutils\dist.py", line 974, in run_command
        cmd_obj.run()
      File "python36\lib\site-packages\setuptools\command\install.py", line 61, in run
        return orig.install.run(self)
      File "python36\lib\distutils\command\install.py", line 557, in run
        self.run_command(cmd_name)
      File "python36\lib\distutils\cmd.py", line 313, in run_command
        self.distribution.run_command(command)
      File "python36\lib\distutils\dist.py", line 974, in run_command
        cmd_obj.run()
      File "pip-install-n80qmf4c\breezy\setup.py", line 153, in run
        print(("ERROR: Unable to create %s: %s" % (batch_path, e)))
    UnboundLocalError: local variable 'batch_path' referenced before assignment

I noticed that 3.0 was just released, so I downloaded the tarball for that and tried to install it and got the exact same error.