Word does not use the riched20.dll that can be installed with UR.
I installed the latest Office 365 on an updated Windows 10 system, configured internal editing of Word documents via
http://kinook.com/Forum/showthread.php?t=1042, imported a Word 2003 document with a table into UR (also tried the same with a Word 2016 document), and was able to edit the file internally in UR -> IE -> Word.