A version update was performed on FINAL FANTASY XI at the following time.
* Clients will update automatically upon launch after the date and time below. After the following time, the update will automatically begin after you press the “Play” button. After that, please follow the instructions on the screen.
[Date & Time]
Apr. 4, 2018 05:00 (GMT) / 06:00 (BST)
FINAL FANTASY XI
*See the version update information below for details.
Source:: Final Fantasy XI