[dgparryuk]

calibre, version 2.5.0
iOS reader applications: Unable to connect to iDevice

and if try to install it while the iOS8 device is plugged in

calibre, version 2.2.0
ERROR: Plug-in installation failed: A problem occurred while installing this plug-in. This plug-in will now be uninstalled. Please post the error message from the details below into the forum thread for this plug-in and restart Calibre.

Traceback (most recent call last):
File "site-packages\calibre\gui2\dialogs\plugin_updater.py", line 712, in _install_clicked
File "site-packages\calibre\customize\ui.py", line 383, in add_plugin
File "site-packages\calibre\customize\ui.py", line 550, in initialize_plugin
InvalidPlugin: Initialisation of plug-in Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 544, in initialize_plugin
File "calibre_plugins.ios_reader_apps.__init__", line 910, in initialize
File "calibre_plugins.ios_reader_apps.__init__", line 1239, in _get_connected_device_info
InitialConnectionError: Unable to connect to iDevice
failed with traceback:
Traceback (most recent call last):
File "site-packages\calibre\customize\ui.py", line 544, in initialize_plugin
File "calibre_plugins.ios_reader_apps.__init__", line 910, in initialize
File "calibre_plugins.ios_reader_apps.__init__", line 1239, in _get_connected_device_info
InitialConnectionError: Unable to connect to iDevice

the 2.2 version is a portable version.....