It took two days and 50% of my Codex Plus week limit, so around 3$. Finally I can play the game on multiplayer again next evening!
It did not work properly on Wine nor Windows 10, that was the entire reason for trying it out.
[1]: https://www.pcgamingwiki.com/wiki/The_Settlers_IV
[2]: https://github.com/elishacloud/dxwrapper/wiki/The-Settlers-I...