Before we discuss the download, we must issue a strong warning.

This is a mod that replicates the Error 422 experience within the standard Minecraft Java Edition. Since Java Edition is native to macOS, this is the most stable way to play. ERROR 422 Mod on CurseForge Requirements: You must have the Minecraft Launcher for macOS installed. Original "Lost Version" (Standalone .exe):

Apple’s macOS has stricter security protocols than Windows, including: