I couldn’t find a verified or official article about a game specifically titled "KOF Ultimate Mugen Gold Edition 2020" — and that’s because it’s not an official SNK game.
File Size: The compressed download is approximately 6.6 GB, but it can expand to over 12 GB once extracted due to the thousands of sprite and sound files. kof ultimate mugen gold edition 2020
The menu system was overhauled. The "Gold Edition" features a sleek, black-and-gold animated menu reminiscent of KOF XIII. Character select screens are organized by saga (Orochi, Nests, Tales of Ash, etc.), making it far easier to navigate a roster of 300+ characters than the standard grid chaos. I couldn’t find a verified or official article
Fan-made Variations: "Edit" characters with modified powers, such as "Evil" or "God" versions of standard fighters. Technical Specifications Screenpack & Aesthetics The menu system was overhauled