macOS disk image of Tor Browser version 6.5.1 for 64-bit OS X with the English US interface. It is an application installer, not repair firmware, schematic or boardview material, and carries nothing specific to any motherboard. The dmg format mounts on a Mac by double-clicking, after which the application is dragged to the Applications folder. Version 6.5.1 is very old and lacks years of security fixes, so anyone needing the browser should use a current release instead of this archived copy.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.