OS error 256

[u/Traditional-Tart-455]

Has anyone else had this issue and how did they fix it. for context im trying to run a downgraded version because the mod menu that i use dosent support the new one yet. downgrading has worked before but for some reason it dosent seem to work anymore. open to any questions. Im on Macos 27.2 and I have a 2025 macbook air