The old Iron Man voice you're referring to is likely the one used in the earlier Iron Man movies, where Tony Stark's AI assistant, JARVIS, was voiced by Paul Bettany. However, in Avengers: Endgame, the AI assistant is now called FRIDAY (Female Replacement Intelligent Digital Assistant Youth), and it's voiced by Cate Blanchett.
When Avengers: Endgame was released, some fans noted a shift in the dubbing cast. Because Endgame was the emotional peak of Tony Stark’s journey, many fans searched for "exclusive" versions or patches that featured the original voice artist to preserve the nostalgia of the character’s final moments. Why Fans Search for "Exclusive" Downloads The old Iron Man voice you're referring to