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I so much loved this plugin I can't work without.
But the latest npp update broke it. NPP does not start anymore as long as the plugin dll is in the plugin directory
I use Window Manager plugin v.1.2.2 just fine in Notepad v.6.6.9 without issue.
That being said, there is an internal virtual clone called 'Doc Switcher'.
To activate go to Settings, Preferences, General, check Show in Document List Panel box.