This appears to be broken in the latest version of Calibre?
Code:
calibre 3.30 [64bit] embedded-python: True is64bit: True
Windows-10-10.0.16299-SP0 Windows ('64bit', 'WindowsPE')
('Windows', '10', '10.0.16299')
Python 2.7.12+
Windows: ('10', '10.0.16299', 'SP0', u'Multiprocessor Free')
Interface language: None
Traceback (most recent call last):
File "site-packages\calibre\gui2\preferences\plugins.py", line 317, in add_plugin
File "site-packages\calibre\customize\ui.py", line 471, in add_plugin
File "site-packages\calibre\customize\ui.py", line 60, in load_plugin
File "site-packages\calibre\customize\zipplugin.py", line 199, in load
File "site-packages\calibre\customize\zipplugin.py", line 183, in load_module
File "calibre_plugins.kepubout.__init__", line 7, in <module>
ImportError: cannot import name KEPubOutput