Having just done this, I would recommend following these steps:
- follow the steps listed by Jim, here
- in addition, following the same basic method, you may want to copy any scripts you have written - you’ll find them in /Library/Application Scripts/com.devon-technologies.think3
- in the DT menu on you old device select License und remove your license
- on the new device go to /Library/Application Support/DEVONthink 3 and delete the Abbyy folder (or don’t copy it across in the first place)
- copy ~/Library/Preferences/com.devon-technologies.think3 from the old Mac to the new one.
- on the new device in the Menu select Install Add-Ons, and do exactly that - including OCR (if you leave out 4. and 6. then on Catalina at least system execution protection (is that what it is called) will call you out on the DTOCRHelper; at least that is what happened to me)
- Register DT on the new device
- Sit back, enjoy your new device