Forum Discussion
MichaelMiller
Mar 03, 2026Bronze Contributor
macOS High Sierra dmg download for making bootable usb insttaller
My old Macbook Air needs a clean reinstall as the disk was erased and no os on it. Currently, macOS High Sierra is the best option but I am unable to download the dmg file from Apple website. It only...
TrappJean
Mar 03, 2026Silver Contributor
This method will typically install the latest supported version on your device, which may not always be the exact macOS High Sierra download version you require.
Step 1: Open Safari on a compatible Mac.
Step 2: Visit the Apple Support page to obtain the legacy macOS installer.
Step 3: Locate the High Sierra entry and click Get.
Step 4: This will launch the App Store and begin macos high sierra download, saving Install macOS High Sierra.app to your Applications folder.
Step 5: Once complete, run the installer without closing it. Keep it open in Applications to create bootable media.
If your Mac supports it, you can boot into Internet Recovery to reinstall macOS High Sierra directly.