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					Originally Posted by johnKarl  Hey ! 
I installed Calibre 5.9.1 , 10 minutes ago..and pff... plugin was uninstalled. 
Now, I have the same error as Greyhunter has.
 
	Code: 'ascii' codec can't decode davidfor : My calibre language is french, so I tried to set it to English... then no error to install the plugin, and it seems to work good. 
Then I get back to French.. and pfff... plugin disappears! | 
	
 It looks like there is a problem with the French translation files. None of the others seem to be causing a problem. It look like a build error as manually compiling the French language file seems to work.
I have attached a fixed copy until @jgoguen has a chance to look at the build.