Also note that you can open the Sigil Preferences directory from Sigil's Preferences dialog (Edit->Preferences). There should be a button located at the bottom-left of that dialog called "Open Preferences Location". Clicking that should get you most of the way to ini file in question. You should be able to go to "plugins/ePUBOptimizer" from the file dialog that opens.
That method will get you to where the plugins are installed, or where the newer plugin_prefs folder is as well.
Last edited by DiapDealer; 06-04-2016 at 07:32 AM.
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