TypeError: 'dict_values' object does not support indexing

[orlp]

> pipwin install lxml
C:\Users\Orson\.pipwin
Package found in cache
Traceback (most recent call last):
  File "c:\dev\python35\lib\runpy.py", line 170, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\dev\python35\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\dev\Python35\Scripts\pipwin.exe\__main__.py", line 9, in <module>
  File "c:\dev\python35\lib\site-packages\pipwin\command.py", line 65, in main
    cache.install(args.package)
  File "c:\dev\python35\lib\site-packages\pipwin\pipwin.py", line 232, in install
    url = self.sys_data[package].values()[0]
TypeError: 'dict_values' object does not support indexing