You can typically find the official MultiBeast 12.3.0 download at the tonymacx86 Downloads section. Note that you will likely need a registered account on their community forum to access the file. Important Compatibility Notes
Technically, Multibeast does not distribute copyrighted Apple code; it merely configures the bootloader to load the OS and installs open-source patches to make third-party hardware compatible. However, users must source the macOS installer themselves from Apple's servers. Version 12.3.0 highlighted the tension between the open-source hardware community and Apple's closed ecosystem, particularly as Apple transitioned toward Apple Silicon, signaling the eventual end of the x86 Hackintosh era. Multibeast 12.3.0 Download
The 12.3.0 update brought several critical internal improvements to ensure compatibility with modern macOS versions: You can typically find the official MultiBeast 12