You can find the official releases, patch notes, and devlogs on hyperk2's Itch.io page

Recent updates (v1.3 and v1.4) focused on "Absol" and "Giro," adjusting damage outputs and fixing glitchy animations to ensure smoother competitive play.

Warning: Because M.U.G.E.N is community-driven, you must be careful where you get your files. Avoid adware-laden "downloaders."