I saw it yesterday and I was tempted because the offer is quite good, plus Anno 1404 has been one of the city builder to which I have dedicated more hours.
that if we purchase the game on STEAM, you will have to download an extra Ubisoft launcher called “Ubisoft connect”
I didn't know this and I find it quite annoying.
Don't you need to download ubisoft connect back then? Today though any game from ubisoft bought from Steam will have ubisoft connect and you'll have to make an account before being able to play the game. It kinda sucks.
Anno 1404 came out in 2008 and I think I played it in 2015-16 or so. Back then I don't remember downloading anything extra, but honestly it was so long ago I don't remember well haha.