Charles, congratulations on getting this done! I downloaded and tested the new version and it looks great.
Since my party in the Gold edition is level 10, I decided not to restart in the DE. Apart from revisiting known territory, my main reason is the movement. In the Gold edition I really like the ease of mousewheel to go forwards/backwards, left click to turn left and right click to turn right. In the DE the left click is gone and it's much clunkier to use the arrows on top. So my plea for a patch for Underworld (and also for Sovereign) is to bring back the left click to turn left as a movement option.
I've enjoyed this game since the first edition came out, so I will be awating Sovereign! How long I don't know, maybe two years? Looking forward to it.