Finally I went for OCRmyPDF (https://github.com/jbarlow83/OCRmyPDF), which uses tesseract for the actual OCR part (https://github.com/tesseract-ocr/tesseract) - as I understand tesseract is a OCR tool that has been open-sourced by Google.
OCRmyPDF has great documentation, also works from the command line and has many language packs:
ocrmypdf -l eng ...
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If this is an essential business function, I wouldn't trust a program to automatically display a changed file. Indeed, by displaying a file, the application might lock it so that it cannot subsequently be updated!
Better might be to display an alert on any changes to files in the folder(s), to let a user open and review the change, and then have the user ...
Have a look at OCRvision. OCRvision is a searchable PDF software. It can convert any scanned documents in a folder to searchable PDF automatically. It supports multilingual OCR.It can be configured for both scanned PDF and image files then convert to searchable pdf
Disclaimer :- I am associated with OCRvision as a developer