This is for all who bought Settlers II Gold Edition from GOG. It's called RttR and is a critical although unofficial add-on for Settlers II. It adds multiplayer and high screen resolutions for today's screen.

the link for the website is www.siedler25.org and although it is mainly in german it also has the english part and most of the community speaks english. Really should check it out!

RttR is not an expansion pack as most will know it. It's more of a rebuild of the original game without chaning anything at gameplay or graphics. It's better compared to OpenTTD,both projects share a lot of similarities.
since it uses the original graphics, you need the data from the game to run it.

https://www.siedler25.org/index.php?com=dynamic&mod=2&type=stable

Sadly no new campaign implemented yet. Also does only work on a folder structure without spaces.