I've updated the historical database one more time now. Looking over the previous version, I noticed that some of the players were essentially split in two, with one player with stats up to 2004, and a second player with the same name with stats only from 05 and 06. This has been fixed in this release, along with a few other issues.
Please read the README file. If you have already started a historical league, you can just replace the 3_NPBwMLBeq_Import folder and things should be fine. Please PM me if you have any questions.
NPB Historical Database, version 0.81