unable to detect operating system

  1. K

    "Unable to detect operating system" Guest OS macOS

    2018 MacBook Pro macOS Ventura 13.3 Parallels Desktop v17.1.16 Guest OS X Mountain Lion 10.8 I have some legacy software that integrates with hardware. I need to run 10.8 or less. Parallels message "Unable to detect operating system" when I try to install OS X Mountain Lion 10.8. If I continue...
  2. B

    Installing older macOS says "unable to detect operating system"

    I have a MacBook Pro and I'm running Big Sur. I'd like to install either Yosemite or Sierra as a virtual machine. I downloaded the .dmg files but when I try to install them it says "unable to detect operating system." Customer support told me that I need to use an .app file, not a .dmg file. I...
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