Click the Format pop-up menu (APFS should be selected), enter a name, then click Erase. Select your startup disk on the left, then click Erase. Select the Format option Mac Extended (Journaled) or APFS. Choose your Mac’s system drive, usually named Macintosh HD, then click Erase. Wait for the macOS Utilities screen to appear, then click Disk Utility. ![]() Hold down the Command and R keys as soon as you hear the Mac tone indicating a reboot. After install, the file would usually be deleted anyway, unless you move it to another location. Nothing at all except you would have to download it again if you ever need it. It is safe to delete, you will just be unable to install macOS Sierra until you re-download the installer from the Mac AppStore.
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