Looks like you can buy on UBI's service or Epic. Although interested to check it out, can't see myself spending $59.99 on this game, unless the reviews turn out to be great.
I'll keep an eye on it for now....
https://store.epicgames.com/en-US/p/the-settlers?epic_affiliate=ggdeals&epic_gameId=84f45b7676af47d9adecd3b636466f89