Zu Online version 1.8.01 has been released today. You can run the client to update the game automatically, or you can download the patch here.
The new version includes a lot of updates, from the new level cap of 259 to a new instance and zones. Here's some more information sent to us by IGG:
In contrast with the previous version, there is a lot of new content in version 1.8.01, which will make the game even more fun. Boundary Hill, the second instance zone of Zu Online has been added. The monsters, especially the boss-level monsters in Boundary Hill are extremely tough, but they drop items that make it all worthwhile. Additionally, another two new high-level zones—Frozen Sea and Wei-Yang Palace have been added.