Fresh install on Windows of Geany and Geany plugins with default settings will install Geany to "C:\Users\Username\Geany 2.0" and the plugins to "C:\Users\Username\Geany-Plugins 2.0". In this configuration Geany does not see the plugins. I have to add "C:\Users\Username\Geany-Plugins 2.0\lib\geany" to the "Extra Plugins Path" in Geany preferences, a step which I do not see documented anywhere.