Running Calibre 2.47.0 PORTABLE and encounters same symptoms as stated here, i.e it appears in plugins but is found nowhere and clicking on it gives the same message to "restart calibre to configure plugin...". Has given calibre.exe and calibredb.exe admin properties in "Compatibility" Options but it makes no difference. UAC is disabled also for the purpose. Q+S installs correctly however.... has not tried it yet thought. Running on Windows 8.1 64bit.
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