Select your internal startup disk (usually labeled "Macintosh HD") and click .
You also need at least and 15GB of available storage space . Step 2: Download the macOS High Sierra DMG
Open the macOS High Sierra download page in your browser. This will prompt the Mac App Store to open. macos high sierra download dmg install
Follow the on-screen prompts to select your internal drive and begin the installation.
This guide provides a comprehensive walkthrough for downloading the macOS High Sierra (10.13) DMG file and performing a clean installation. Whether you are reviving an older Mac or need a reliable environment for specific legacy software, High Sierra remains a stable and popular choice. This will prompt the Mac App Store to open
Click "Get." This will download a file named Install macOS High Sierra.app into your Applications folder.
If you specifically need a .dmg file for virtualization (like VirtualBox) or deployment, you can use the hdiutil command in the Terminal to convert the .app installer into a disk image. Step 3: Create a Bootable USB Drive Whether you are reviving an older Mac or
Release the key when you see the bootable volumes; select the "Install macOS High Sierra" drive. From the macOS Utilities window, select Disk Utility .
Apple officially provides legacy versions of macOS through the Mac App Store and their support website.