yeah i downloaded from here.
i installed it fresh, not upgrade.
and i just wipped it out and reinstalled it again, but still, it keeps showing it everytime i log on to the admin page.
plus, after i restored a database from another machine (the sql file came off from 2.0.15, too), all the characters are not showing correctly (funny characters), it should be showing traditional chinese encoding just like on the other machine.
i did set the brower encoding to match the language, but then when i click "refresh" or "reload" button, there it goes again....
it only happens when i import a previously existed phpbb database to the new installation. everything shows fine except the warning message on the admin homepage, no funny characters showed on the original database that comes with the new installation.