What is GOG?

GOG is the abbreviation for Good Old Games. It is a platform that offers old games for download at low prices. Among other things also settler 3 is in the offer:

https://www.gog.com/game/the_settlers_3_ultimate_collection

• aLobby supports the latest version of Settlers 3 provided by GOG.
• Where can I find my serial number if I bought the game from GOG