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The OCR plugin doesn't work as expected. A document is loaded in PdfXChange and the plugin is initialized. When opening the preferences-page you can see the OCR-Plugin as an activated entry. In the filesystem a folder PluginsData with subfolder OCRLanguages exists and contains files deu.lng and eng.lng. So the setup in general seems to be ok.
Can you please check (through the Editor UI) which of the OCR engines is active. (Preferences -> OCR )
If it is the Enhanced OCR engine - I believe this one is not included for use through the SDK.