I only wanted to give a hint that there is an addon existing for the first part of the series, which I also didn't knew before. I discovered it two days ago. It's name is "Die Rache des Regengottes" (Revenge of the rain god). Maybe it's possible to add the game to your library. This would be great!

The mentioned add-on had been included in the german version of "Cultures Gold".

And question about cultures gold, does it change anything in original cultures vinland part of game, or does it only have an add-on campaing that should be played

As I have never played the normal Vinland campaign I do not know for sure if there are differences to the "Cultures Gold" version of that campaign. However the "Revenge of the Raingod"/Rache des Regengottes add-on is a separate campaign to chose, so I would guess that Vinland stays unchanged. See attached screenshot.

The gold version adds two Christmas missions to the main game. In addition, a nice screensaver is included in the Gold version.

I have the CD version and this CD does not need to be in the drive to play, unlike the main game and add-on. Translated with Google.

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Die Gold-Version fügt dem Hauptspiel zwei Weihnachtsmissionen hinzu. Zusätzlich ist in der Gold-Version ein netter Bildschirmschoner bei.

Ich habe die CD-Version und zum Spielen muss diese CD nicht im Laufwerk sein, im Gegensatz zum Hauptspiel und Add-on.