It is highly likely that "v303" and "bonus co" refer to or unofficial data updates designed to keep the game current with real-world events. These mods often include: Common Community Update Features
, the community has produced significant and "bonus content" megapacks to bridge the gap between FM24 and FM25 . 1. Key Update: TheNotoriousPr0 v3.0 Megapack football manager 2024 v303 hotfix bonus co