In order to get more maps, monsters, quests and functions, DOFUS offers regular updates and additions. The only important thing being: TO HAVE FUN.
Minor updates
For the first time in the videogame world, you can benefit from novelties without having to download them. In this specific case, everything is automatic. You don't have anything to do to enjoy them.
Major updates
When considerable additions or improvements are made, you must install them. But as DOFUS is a genuine videogame concentrate, installing the new version is as simple as updating the old one. It's up to you.
