I have edited for BW 10 UserLex:
1) Nave's Topical Bible (5349 words) public domain;
2) Smith's Bible Dictionary (4587 words) public domain.
You must extract the file in BibleWors 10\UserLex\ folder (and select from UserLex options "change userLex folder" and so select "Nave's Topical Bible" or "Smith's Bible Dictionary" folder (don't select "english" sub-folder).
Here is the links for download: