There’s no longer a script in DT Personal 1.9.5 for printing/saving as PDF to DT. Unless you make the following changes, you will receive an error message for that operation.
Here’s how to restore that option:
[1] Remove the older script from version 1.9.4 from /Library/PDF Services/ (you may need to check both the boot volume /Library/PDF Services/ and your /UserName/Library/PDF Services/ folders).
[2] In the Finder, make an alias of the DT PE 1.9.5 application.
[3] In the Finder, drag that alias into your boot volume/Library/PDF Services folder.
Now you can use the Print dialogue, e.g., from Safari, to save a document into DEVONthink 1.9.5, either as text or PDF+text, depending on your preferences settings in DT.
Just click on the DEVONthink PE alias in the options presented under the PDF button of the Print panel.