My DEVONthink version is 3.7.2 and the Abby OCR version is 1.1.17, I can’t use the OCR to convert pdf to a scannable one, which previously work well. My system is Big Sur. I’ve tried reinstall the Abby OCR, but not work still. What should I do now?
What does actually happen, is an error logged?
Same here, the error log is empty.
Try this…
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Quit DEVONthink.
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In the Finder, press Command-Shift-G and paste: ~/Library/Application Support/DEVONthink 3 .
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Move the ABBYY folder to your Desktop and relaunch DEVONthink.
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Select DEVONthink 3 > Install Add-ons… and reinstall the ABBYY Finereader OCR.
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Quit and relaunch DEVONthink.
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Attempt an OCR process. If successful, you can delete the ABBYY folder on your Desktop.
I followed your instructions. The download from ABBYY server was really slow.
After restarting DT3 OCR is working again 
Thank you very much for your support!
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Unfortunately, we don’t control the download servers and the throughput can depend on a variety of factors.
However, I’m glad to hear it’s working as expected now.
And you’re very welcome! 
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That’s not really a problem, it only caused a longer time until I could answer
Thanks for understanding. With how fast connections can be, it’s sometimes hard to be patient when it’s not so fast
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Thank you, but it still does not work.
Hold the Option key and choose Help > Report bug to start a support ticket.
Thanks.
Thanks very much，I don’t know why, but after I reinstall DEVONthink, the problems solved.
You’re welcome and I’m glad to hear it!
I lately realised that OCR is not really producing “Searchable PDF”, even no Error or Warnings 
Moving ABBYY folder and reinstall Add-ons got back OCR functionality.
However, two folders ( moved and newly installed ) are byte identical. Hopefully future releases do not carry forward this issue.
Welcome @hoysala
If you are referring to the original folder you moved, delete it.