The following problems can cause this error: 1. Maybe the downloaded
Installer file is corrupt -> please download the Installer again from
the website 2. Maybe antivirus program, firewall program blocks some
installed files -> try to disable temporal...
Questions: Do you have any external drive? If yes, can you unmount it
while running the Archicad Installer? Do you have any mounted dmg? I
think you mount the Archicad Installer dmg. So, please mount it, copy
the Installer app from it to somewhere, t...