Go to Settings > Storage . Click the empty optical drive icon under the Controller: SATA section, click the disc icon on the right side, and select your macOS_High_Sierra_10.13.6.iso file.
The file is a highly sought-after disk image that allows users to install Apple's 10.13 operating system on virtual machines (like VirtualBox or VMware), create bootable USB drives, or rescue older Intel-based Mac hardware . Released as the final security and stability update for the High Sierra lifecycle, version 10.13.6 represents the most stable and refined iteration of this specific macOS generation.
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This error usually points to an outdated system date on your computer's motherboard clock. Because High Sierra’s security certificates expired years ago, the installer rejects the machine configuration if the current date is read as 2026. Macos High Sierra 10.13.6.iso
Because Apple does not natively distribute macOS in an ISO format, you must convert the downloaded .app installer into a bootable .iso image using the Terminal. Follow these precise steps: 1. Create a Blank Disk Image
Finally, the installation completed, and John's MacBook Pro booted up with a fresh installation of MacOS High Sierra 10.13.6. He was prompted to set up his computer, including setting up his Apple ID, configuring his network settings, and creating a new user account.
A: APFS is optimized for SSDs in High Sierra. If you are using a traditional HDD, the installer will keep it in HFS+. Go to Settings > Storage
Under the settings, mount your HighSierra.iso file into the virtual optical drive.
If your goal is to create a physical USB flash drive to install High Sierra on a real Mac (not a virtual machine), you do not necessarily need an ISO file. Apple's recommended method uses the .app installer directly.
Open System Preferences > Software Update and install: Released as the final security and stability update
Open Terminal and run this command. It will create a .cdr (a type of disk image) sized at roughly 8 GB, which is more than enough for the installer. You can change the ~/Desktop/HighSierra path to save the file elsewhere.
After you have the Install macOS High Sierra.app in your Applications folder, you can convert it into an ISO file. The following method uses the command line and is highly reliable.
: Developers and system administrators frequently use ISO files to run macOS High Sierra in virtual environments like VMware, VirtualBox, or QEMU for testing legacy applications.
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Go to the VM , click the empty optical drive icon, and choose Select a disk file . Browse and select your HighSierra.iso file.