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#Download mac os high sierra iso file from official site installClean installing or restoring a Mac offline with USB pen driveĪs said earlier, you could use the macOS USB installer to do a clean install or restore it upon a boot failure. If you have a macOS DMG, you can create bootable USB disk from a Windows PC - use a software like TransMac for this purpose. But think about a situation when your only Mac stops to boot, and you don’t have USB installer or TimeMachine backup! Downloading MacOS DMG file might save you. This method is applicable when you have a Mac, and the internet recovery fails. What is the alternative if I don’t have usable Mac at the moment? #Download mac os high sierra iso file from official site manualCheck the instructions on Apple website, the manual method to make macOS offline USB installer. Unfortunately, the above app is not compatible with macOS Big Sur 11 and above. Unmount and keep the USB installer to a safe place. When it completes you will find Install macOS Mojave (or High Sierra) mounted to your desktop as a USB disk.
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