Downloading ROMs for games you do not own exists in a legal grey area. We strongly recommend owning a legitimate copy of The King of Fighters 98 (available via the SNK 40th Anniversary Collection or Neo-Geo Arcade Stick Pro) before downloading any hacked ROMs.
If you want to play against other humans online with flawless rollback netcode, download Fightcade. It utilizes FB Neo as its core emulator. kof 98 anniversary edition rom download best