With Action 4: The Expedition set to launch next week comes a brand new Dekaron client. Unfortunately, anyone running the existing Dekaron client *will not* be able to patch up to Action 4.
ALL PLAYERS will have to re-download and install the game before being able to get into the game from Wednesday 24th September, the new client will be available through our mirror sites from Friday, why not download it in the background while you take advantage of the amazing 25% off in the Dekaron item shop.
Remember - you will first need to un-install the existing client before installing the new client
Source from EU Dekaron official site.