Search for the "Final Fight LNS Ultimate v.04.pak" file. Do not download random .exe files from untrusted sites. You want the .pak file, which is the game data. The typical file name is FinalFightLNSv04.pak .
The final boss, a corrupted cyborg warden named ZALGO-7, loomed on the screen. It wasn’t just a sprite anymore. In v.04, the developers had done something diabolical. ZALGO-7 learned. It adapted to your patterns. If you blocked too much, it threw unblockable grapples. If you jumped, it anti-aired with perfect frame accuracy. If you panicked, it smelled it.
In v.04, if you want to cheese the game, select (unlocked by beating Arcade mode with Haggar). Zangief’s Double Lariat has invincibility frames on startup and his Spinning Piledriver kills any normal enemy instantly.
The "Ultimate" in the title is not hyperbole. It implies a mashup—a massive crossover event where the universe of Final Fight expands to include characters from the broader Capcom fighting universe.