The FlyffUsaSetup_xfire.exe file you have requested: Official Demos / FLYFF: Fly For Fun Client - XFire - 603.14mb is not available. Perhaps try browsing all files for the game Flyff! Fly For Fun! and upload any files you want to share or are missing. This is the only information we could locate:
FLYFF: Fly For Fun is a free-to-play 3D MMORPG based in a flying fantasy environment. Flyff features many job classes, quests, character levels over 100, PvP, Guilds, and various in-game Events.