A particular plugin or all plugins?
Have you done a calibre restart (Ctrl+R) - must restart calibre after installing any plugins, you should have got a popup with the restart option.
Otherwise have a look in Preferences->Miscellaneous->Open calibre configuration directory->plugins.
Added: maybe you don't get the Restart popup if you install from a file. But you still need to do a restart.
BR
Last edited by BetterRed; 10-16-2019 at 02:43 AM.
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