This was an Add-On for "The Settlers 2: 10th Anniversary", but only for the german version. What are the odds to get this Add-On on GOG.com someday? This Add-On includes a new campaign with the Vikings and fixes some strange bugs from the original version.

The add-on is not only available in german. There is also a Czech, Polish and Russian versions of the Vikings add-on. But as long as there is only a fan made english version I would say we will never see it here.

It was me who made the fan translation of this addon.
It's not that difficult to get it working, I made a helper app to install the German addon on the English game, so it's as easy as it gets: run the helper app, insert the addon cd when asked to do so and it installs. A second installer fixes the translations to English.

You can read about the procedures and get the downloads in the UBIsoft forums: http://forums.ubi.com/showthread.php/203258-Vikings-add-on-How-to-Install-Play-on-English-Version?p=1832447&viewfull=1#post1832447

I hate to say so, but if you want it, probably your best bet is to get it second hand from amazon.de(http://www.amazon.de/gp/offer-listing/B000MCHERS/ref=dp_olp_used?ie=UTF8&condition=used) or illegally download the German addon cd

I'd like to see gog offer it, and I also offered GoG to use my translations for free, but never got a reply to that.

I am still waiting for this Add-On. I have the original on the disc. Unfortunately, I can't buy the expansion anywhere. I would like to see it on GOG, so I can share this game with friends to play online.